Question about 1989 Chevrolet C/K 3500

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Lack of power in a 1991 Chevy 454 TBI.

I have a 1991 Fleetwood Bounder on a Chevy Chassis. The engine is a 454 7.4L TBI. Coming home from a trip, I lost power. I could only do about 15mph. After limping home, I changed the fuel filter, MAP sensor, oxygen sensor, plugs, rotor, cap, and fuel pressure regulator. Still the same problem. NO POWER. It idles for a few seconds and then starts to stall and then picks back up. It continues to do this. When I rev the engine it doesn't even try to rap out. Can anyone help?

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  • tomshamp Feb 12, 2010

    I changed the Throttle Position Sensor (TPS) as you suggested and it helped. It will now idle smoother, but when I put it in gear, it tries to stall out and the power is still not there. Any other ideas?

  • tomshamp Feb 12, 2010

    I replaced the TPS and it helped smooth the idle, but whenever I put it in gear it wants to die and I still don't have the power. Any other suggestions?

  • Airstream Apr 26, 2013

    My 454 is doing the same thing. Let me know if you get it resolved I think it might be the ECMon mine.

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Replace the Throttle Position Sensor (TPS)

Posted on Feb 08, 2010

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