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Re: 1997 chevy express 2500 running rough when it does...
How about the air filter and the fuel filter. Either one of those could cause these syptoms. you could also have a weak fuel pump. But check the filters first and get back to me, Raz
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What you are saying is the engine runs rough under load. If the fuel system is in good condition, the ignition system would be my first target. You mentioned plugs wires and rotor. Did you replace the cap ? What about the coil ? The pickup in the bottom of the distributor ? Any of these components could cause a miss-fire. Even a faulty O2 sensor could cause a lean fuel mixture. Is the check engine light on when you are driving ?
All GM have ignition coil problems , your getting too much fuel , I have seen O2 sensors and plugged catalytic mufflers too many times , be careful the next ride the vehicle will catch on fire..Try the coil first
if you replaced the plugs in wires in it is still doing it id looking in to changeing the dis cap in rotor bug in the dist or you mite have bad gas in it
Is this a 5.7? They are notorious for intake manifold gasket leaks. When mine did it, the diagnostics blamed it on an ignition misfire also! Replaced the gaskets and it runs smooth!
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