1996 4.3

i have a 1996 chevy blazer with a 4.3 cmfi my problem is that its very had to start but starts right up with eather and has no power in passing gear or in the higher rpms sounds like its really boggy i checked the fuel presser its about 62 or 63 all the time replaced the iac valve the fuel pressure regulater tested most of the sensors lik the map tps iac (replaced) but still nothing is helping can any one else help?

Try cleaning the EGR valve. Also when was the last time you did a tune up?

just did a tune up about 2000 miles ago new plugs wires rotor and cap

cleaned it dident do anything also after it warms up it starts fine

I would suspect a fuel issue...  Not fuel supply, but more quality and/or contaminant level (water, etc).  Maybe try a can of isoheat in the tank and see if that helps.

Good idea. That happened to me. I used dry gas and it fixed it.

just put a fuel pump in it today and fresh gas when i puled up to the filler it quit and now seems to be hydro locked

pull hte plugs, crank the engine over and the gas will come out the spark plug holes. Careful, it is highly flammable.

If you let it sit long enought he gas will drain intot he oil pan. Check your oil.

Fuel pressure regulator is no doubt the reason for your leak/hydro lock.
Takea a lot of fuel to hydro lock teh engine.

as for starting when hot and not cold, check that IAC again. Also check for false air, a n air leak after the MAP/MAF.

i gues ill tear it all apart again

pulled the plugs yesterday then read your post i unpluged the fuel pump power wire and it started when u plug it back in it does the same thing it hydrolocks i guess ill try the old one

The fuel pump is not at fault if you are filling the engine with fuel... You have a fuel leak internal to the engine! Most likely culprit on a SCFI motor such as you have is the fuel pressure regulator.

no **** i was clearing the engine out of fuel so it wouldent be hydrolocked so i unhooked the fuel pump so it would burn off the fuel in the engine                            now if i left it pluged in and pulled the plugs wouldent it still be pumping the manifold full of fuel???                                            and i dident have this problem untill i changed the pump              the reason i changed the fuel pump is that i noticed cold staring it was only pushing 35 psi

Sounds frustrating.  And it seems like your frustration is coming through in your posts and directed towards the people who are trying to help you.  I will say this, of all the technical and knowledgable people on here, NONE of them do well with language or being disrespected.  They are taking their own time to answer your posts, sharing the information they've learned over the years.  Take it easy on the language.

Keep at it and try not to get too discouraged.

i know im verry srry but i felt i was being disraspecked telling me its not a fuel pump issue on cold mornings the old fuel pump was pushing only about 35psi until it was running this hole thing is driving me nuts 2 weeks ago i put a fuel presser reg. in it to see if that was the problem and now i have to do it again and i already put a new iac sensor in it too

It seems we are having a difference of terms here. What do you mean by hydro-locked? Typically, the term hydro-locked is used to state that an incompressible liquid has filled one or more cylinders of the engine, preventing the engine crank shaft from rotating.

We are trying to help here...

yes that is what i meen the cyclenders are filled up with fuel i pulled the plugs unpluged the fuel pump and turned it over then put the plugs back in started it up and let it burn off all the fuel that had built up and tomaro im going to replace the fpr again and see if it helps and im really sorry for the cursing it just really frustrating i wonder if oriellys sold a foulty or different fuel press reg it was a little diff looking but it fit fine ill try it again

Ok. You know that there is a leak somewhere under the plenum.

Now, here is how I would approach this. Remove the fuel lines from on top of the engine. Then remove the plenum. Reinstall the fuel lines and pressurize the fuel system, looking for leaks. It is possible that the o-ring on the FPR got pinched during assembly or something else completely unrelated. If fuel is pouring out of the FPR nipple, the FPR is completely at fault.

yep that was exactly what i was thinking just remove the plastic cover and hook the lines up and turn the key on ill do that tomaro
 

turns out the oring on the pressure reg squeezed out one side shes all back togather running like a champ thank you very very very much

I knew it was going to be something like that!  Good job on getting it all fixed up!