Question about 1989 Chevrolet C/K 2500

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Got a chevrolet pick up 1989 year 5.7L engine,it

I have a chevrolet pick up 1989 year 5.7L engine,it was it running rough when it idle,my mechanic check that no# 2,8,5,3 is missing,we replace all spark plug,spark wire,distributor cap and rotor,check all compression is 150psi,we replace inlet manifold gasket and check for vaccum leak but still the same

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CHECK THE CARB OR TDI MOUNTING BOLTS FOR TIGHTNESS OR CARB OR TBI GASKET LEAKING.COMPRESSION ACCEPTABLE YOU STILL HAVE INTAKE MANIFOLD LEAK. STOP UP FUEL FILTER.WEAK IGNITION COIL.WORN CAMSHAFT.

Posted on May 29, 2010

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Posted on Jan 02, 2017

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Check the CO/Temp sensor in the exhaust manifold. It may tell the ECU that the engine is hot when it is cold or cold when hot, getting the mixture wrong.

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For the no downshift, slow down lol. It could be an out of spec throttle cable. Check to make sure the cables are free and clear of debris and no kinks are present. The throttle linkage should move freely while the engine is off and again while running, be careful here.

Unfortunatly we may have to face the truth the old girl just doesnt have it in her anymore. Take it slow and easy, shes earned it.

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My opinion...

Year? Miles?

There's no way I'd dive into a "HEAD GASKET"
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