There is very little power now. This has been going on for 6 months now. Diagnostic test done, picks up nothing.
It is possible that the issue is related to the fuel system. The fuel pump may be failing or the fuel filter may be clogged. It is also possible that the spark plugs or ignition coils are failing. It is also possible that the catalytic converter is clogged or the exhaust system is blocked. It is also possible that the mass air flow sensor is failing or the air filter is clogged. It is also possible that the throttle body is dirty or the throttle position sensor is failing
Check fuel pressure, check for exhaust restriction, check MAF sensor signal with a scan tool.
SOURCE: loses power when driving
May just need tighten up a little check the belt see if its dry rotten.
SOURCE: 1990 chevrolet c1500 silverado
Things to check
timing
ignition system: coil, plugs,rotor,cap, lead wires
dirty injectors
fuel pressure
air filterfuel filter
EGR system
air leaks at throttle body and manifold
SOURCE: 2001, Duramax Deisel 6.6 won't "restart"
fuel pump is obviouslynot working !
check it & its wiring!!!!!
SOURCE: 2000 Chevrolet Truck S10 P/U 2WD 2.2L , loss of power
The first thing to try is a new fuel filter. There is sock filter within the fuel tank also, but it fails less often. If the engine has lots of miles, it may need a new O2 sensor although the codes should point that out if it were a problem.
SOURCE: rough idle, power loss while driving
check /replace the fuel filter and check the fuel pump pressure before and after the bleed valve to the throttle injectors
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