need help with 91 lumina

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  #1  
Old 11-22-06, 08:16 PM
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need help with 91 lumina

Need help with 91 lumina 3.1. When you try to go a stedy speed . And you let up a hair cuts out and bucks like you hit the rev limiter. Have replaced plugs and wires fuel pump map senser. But none helped still does it when you rev it up some. Black smoke comes out of the egr could that be it any suggestions what it could be thanks
 
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Old 11-23-06, 08:27 AM
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Could be a few things:

Fuel filter

Fuel pump

EGR Valve

PCV

and maybe the throttle position sensor.


I would lean towards the valves.
 
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