Question about 1991 GMC C1500

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91 c1500.5.7 engine runs great at high rpm. but when i first press the accelerater from an idle it hesitates & tries to stall, when it idles down from higher rpms it has a miss/hesitation as well. new parts are; cap/rotor wires, plugs, new t/chain & gears, fuel system cleaned. tell me what to check next????

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  • 170 Answers

Check timing ?

Posted on Dec 03, 2017

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6 Suggested Answers

Anonymous

SOURCE:

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Posted on Jan 02, 2017

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Anonymous

SOURCE: '91 Honda Accord, Auto. Hard to

The main relay for fuelpump,under dashboard left side

Posted on Aug 15, 2008

Anonymous

  • 71 Answers

SOURCE: 92 chevy truck 5.7 idle revs up and down high emissions

sounds like a vacuum leak check hoses and manifold

Posted on Mar 28, 2009

cadman000

Eric Heifetz

  • 607 Answers

SOURCE: 95 GMC hesitation

By "OVERDRIVE '' . are you meaning the TCC ( torque converter clutch ) is engaged ? and if so, when you increase RPM's to accelerate, it should disengage otherwise causing a noticeable hesitation. Hope this helps

Posted on May 07, 2009

Anonymous

  • 1 Answer

SOURCE: engine hesitation

try replacing the vent tube in the carb. you can get one from rocky road outfiters http://www.rocky-road.com/venturi.html hers the lnk

Posted on May 15, 2009

localwonder

Michael Masters

  • 6784 Answers

SOURCE: the car hesitates when pushing on gas at 4000 rpms

Hi, i recommend changing the fuel filter and pump. these devices are dirty or clogged with debris. I also would recommend adding a fuel tank and injectors cleaner to the tank once you have replaced the pump and filter. this will scrub the fuel lines and injectors as well. this will increase the fuel economy of the car and it will clean the fuel system thoroughly. you should notice an improvement after you apply these changes to the cars fuel system.

Make sure the wires and plugs are in good condition. if the wires are old or fouled in any way, replace them along with a new set of spark plugs. change the air filter also.

please rate and have a great day:)

Posted on May 18, 2009

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