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1990 chevy 1500 4x4 5spd. New plugs,wires, cap, button, tps, coolant sensor. Hesitation under throttle. And also runs bad after warmed up. Im fed up with throwing parts at this problem. Im thinking maybe fuel pump or injectors on the hesitation but the warm/cold problem has to be a sensor right?

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  • 373 Answers

My 97 was doing this, I too put a lot of money before figuring out that it was a bad coil and coil wire. Works great now. Do you have the 4.3L

Posted on Jan 20, 2013

  • ivan robinson Jan 20, 2013

    No its the 350 and i put a coil from the junk yard on and a new coil wire with the plug wires. But thats a good possibility since you dont really know what youre getting when you buy a used part like that. Ill try and change it and see if there is any improvement.

  • ivan robinson Jan 22, 2013

    Also has a surge/**** under throttle but if i floor it it will power thru but only under heavy throttle.

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lovelle40
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SOURCE: 95 chevy truck 4.3 motor has like a miss in high gear after warms

The fault could be in the ingnition module in the dist.I had a car one time that did the same thing but when it was cold,try replacing the the ignition module.

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SOURCE: 2000 kia sportage trouble code po171 once in

I have 2005 Kia Sportage with a check engine light. No other symptoms. I was told by Kia and Local mechanic that it is the fuel injectors. Error Code states that Fuel injectors are running lean. Put Master airflow- no change. Ran engine test with propane to run rich and trim never changed from 15. Car runs great. Kia dealer said that this is because we use Ethel in gas that it effects the alumium fuel rail delivery to the injectors and that it is necessary to change all of them .Kia Dealer wants $1,000.00 deposit to place order 6 fuel injectors from Kia. (Has anyone heard of that?)Also put fuel injector cleaner in tank.Does anyone have any suggestions before I spend over $1,000.00 to replace all 6 injectors or possible idea of what could be wrong?

Posted on Jan 07, 2010

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SOURCE: Astro HESITATES upon initial accellerating.

My 1996 Astro does the same thing... It has new fuel pump, fuel filter, plugs, wires, cap, rotor, maf sensor, ignition coil, alt., battery, cat converter, im stumped...

Posted on Apr 25, 2010

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Code 12 means you are in test mode, code 34 is a problem with the map sensor, and code 35 is a problem with the idle control valve.
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Code 21 has to do with the TPS (throttle position sensor) voltage being to high. You'll need a DVOM (digital volt ohm meter) to check this out. Unplug the TPS sensor and check for 5volts on the grey wire, and make sure the black wire has a good ground. If those check out plug the sensor back in. Back probe the blue wire. you should see around .5 volts with the throttle closed. The voltage should go up smoothly as you slowly open the throttle. At wide open throttle the voltage should be around 4.9 volts. If any of the above three are not true I would suspect a bad throttle position sensor.

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