Hmmm. The usual culprits for bogging down are Cat Converter and stuck EGR. The EGR would throw a code though ... Cat would also probably throw some sort of code. It would also glow red color if it were clogged.
is everything mechanically sound with the accelerator pedal in the cab and throttle cable linkage under the hood? cleaned the throttle body butterfly lately? got a good air filter in there?
is the tach on the dash good? do you have a remote tach to verify things?
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Originally Posted by jimbobillybob
Hello I just bought this truck it has the 4.3 vin W bogging issue.
Both cat's have been replaced but it still has the issue[won't rev over 3 grand] when cold after it has warmed up the guy told me it's not as bad and will rev to over 3 grand.
So far they have taken it to a chevy dealer and 2 different shop's every one is baffled. NO codes and sensors and fuel pressures are in range.  |