Question about 1991 GMC Sierra

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My 1989 gmc pickup is surging wile ideling and bogging down wile driving already changed rotor cap wires plugs map sensor and cleaned injectors and throtelbody

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Check the fule pump sounds like its starving of fule

Posted on Aug 28, 2010

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I HAVE A 1988 GMC 5.7 V8 PU...IDLES UP & DOWN WHEN COLD...SURGES...NO POWER COLD...RUNS GOOD AFTER IT WARMS UP...NO CHECK ENGINE LIGHT...TIMING CHECKS OK...PARTS ALREADY CHANGED:...COIL-PLUGS-PLUG...


Remove the vacuum lines on the bottom front of the throttle body with the engine off. Check each hose connection with a nail; small screwdriver or a small drill bit. Make sure they are not clogged. If they are clean them out carefully. If they are not clogged, then check to make sure the vacuum lines aren't obstructed. I refer to your idling up and down as hunting. Reconnect the vacuum lines and start the engine. If it idles smoothly, your found your problem. Good luck.

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YOU COULD HAVE A RESTRICTED EXHAUST.MUFFLER PLUGGED STOPPED UP ALSO THE CATALYTIC CONVERTER COULD BE PLUGGED.

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1989 GMC 2500 5.7L - engine surges and stalls at idle. Loses power at cruising speed. I've already changed, plugs, cap, rotor, wires, fuel pump,filter & lines, TPS, IAC, EGR, MAPP Sensor, intake...


Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.

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Just a thought, have you checked yout TPS(throttle position sensor)? I had similar problems with my 89 GMC Jimmy 4.3l, however a code 44 is strange. Also check to see if your problems go away if you advance the timing a few degree's.

Hope this helps

Jun 15, 2008 | 1995 GMC Sierra

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