Rough acceleration

[usmcanson]

87 357 tbi. Idles great. After driving for 5-10 minutes blazer no longer wants to accelerate. It cuts out, if i let off the gas it continues to run and idle fine but that is it. If i have to drive it i have to take off very slow and continue. Even when parked it will not rev up. It acts as if there is a rev. limiter kicking in at around 2500-300 rpm.

 

[1985_K5_Silverado]

Is the ECM tossing out any trouble codes?

 

[usmcanson]

It's giving a code for O2 sensor...that's it. Today it actually stalled. After letting it set for a few hours it started and took me back home. I have a feeling that it it the fuel filter

 

[Thunder]

If you are getting a code 44 (02 sensor lean exhaust) Yeah try replacing the filter. Should replace the filter every 10-12 k miles for best performance.

 

[bigblock72]

Sounds like you may have a fuel pump checking out. Replace that fuel filter if it's very restricted it can kill the fuel pump. The other things I see on those are bad distributors, plug wires, and coils. The easiest thing to do is connect a fuel pressure gauge and go from there. If the pressure drops below about 11-12 PSI than the pump is bad, if the pressure doesn't drop then go to the spark side.