I have a 1995 Chevy blazer with a 4.3 with the spider injector. To start with it has a new distributor cap rotor wires and I'm sure new spark plugs and new fuel pressure regulator. Egr has been cleaned and there are no vaccum leaks. The car runs OK when first started up but after driving for a little bit it starts lunging jerking and rough acceleration. When I slow down and stop the car stalls and takes a minute to start back up. Sometimes after it stalls I can get it to crank back up but then it dies again. I can keep it running for a few seconds by pressing the throttle then it dies. I'm leaning towards bad iac. Has anyone experienced this issue.

 

check for a plugged cat and maybe do a fuel psi check

 

1995 used 2 different fuel injection systems, and 3 different computer control systems. Diagnosis procedures and specs are different, so we need to know what you have. Does your distributor cap look like this:



Or like this:

 

Looks like the bottom one. I will do a fuel pressure test this weekend.

 

Is there a way to check the cat without taking it off. Its stuck on I can't get it off.

 

The best way to test a converter for restriction, is using a pressure gauge in the oxygen sensor mounting hole forward of the converter. As an alternate, you can remove the sensor and test drive it. Be aware that it will blow very hot exhaust out the hole, we don't want any fires

 

OK I'll try that. Anything else to check. I've looked everywhere and CNT find anyone who has had the same problem. Where is the valve to test fuel pressure

 

I also tooke the iac off and it doesn't look dirty. How can I test it to see if its bad. And where is the valve to check the fuel pressure.

 

https://blazerforum.com/forum/2nd-ge...eakdown-88305/