Drive Train Axles Bearings problem
1991 Chevy Caprice V8 Two Wheel Drive Automatic
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my car loses power after running about 4 minutes from a cold start. i have to really work the accelorater to keep it moving. at first i thought it was the tran. but the fluid level is fine; and it shifts normal when cold. the engine runs ok- rpms, etc...
any ideas?

Sounds like a semi-plugged or plugged catalytic convertor OR a weak fuel pump to me. When its happening, step on the brake pedal. If the pedal is hard, most likely a convertor as a plugged convertor will take away engine vacuum and the brake pedal is powered by engine vacuum.

i also have same problem with losing power i have changed fuel pump and strainer fuel filter egr valve spark control module and new plugs rotor and wriers /cap what else the check engine light comes on then loses power code 43 every time

Code 43 is a knock sensor code. Either the sensor has picked up a knock and has retarded the timing (loss of power?) or there is something wrong with the knock sensor system making it retard the timing when it shouldnt. Thats going to be a really hard one to diagnose online.

Jetsa wrote:

Code 43 is a knock sensor code. Either the sensor has picked up a knock and has retarded the timing (loss of power?) or there is something wrong with the knock sensor system making it retard the timing when it shouldnt. Thats going to be a really hard one to diagnose online.

I have changed the knock sensor just forgot to add it on here sorry