Question about 1999 Chevrolet Silverado 1500

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While in drive and idleing it hesitates like its missing. i have changed the plugs,wires and coil pad,but it is still hesitating.what could be the problem?

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A fuel pump starting to go bad or clogged fuel injectors.

Posted on Feb 05, 2010

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I just replaced the spark plugs on my 98 ford explorer suv 5.0. do i need to have the ignition retimed?


Wow! So many things can cause hesitation or miss. Did you run the OBD II scan? Auto-Zone will scan it for you. Usually on an older car,unless the spark plug wiring has been recently replaced,you need to do that too.
Then you have a lot of age on the coil pack also.Also clean your MAF sensor and your idle air control valve at the throttle gizmo.
Describe the hesitation a little more. don-ohio (:^)

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Occasional miss or hesitation while driving will also do this at idle have checked points and set at 20 thou have changed plugs set timing at 7btdthen advanced a little after no change leads are only...


You set the gap at 20 sould be 16,a hesitation or occasional miss is not from the points or condensor, its from the craburator,its a power valve or your float getting the hesitation can be the secondary not feeding at wide open throttle, the carburator is faulty, and plus todays fuel is not meant for carburators

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You state you changed plugs and wires - Do distributor cap & rotor? If not you should then set timing. That should cure hesitation (might change fuel filter also and run good fuel system cleaner through it)
Prob 2 - sounds like a u-joint or possible brake pad/rotor issue. Does the squeal only happen in mornings when cold? Sometimes after sitting overnight, rotors get condensation and when backing out they'll squeal/grind. Somethings to look at...

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When your driving the car hesitates sometimes real bad and sometimes a little bit and when the car is idleing the engine hesitates a little bit


that can be anything from a bad spark plug to a bad spark plug wire. check your spark plugs, plug wires, coil pack or packs, and if nothing comes up there your timing blet or chain might have sliped.

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check plugs, wires, and coils for proper spark.

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My 1995 4.0L YJ has a miss while idling and hesitation while driving. I have checked the fuel pressure, 50 PSI, however when I removed the vacuum line from the fuel pressure regulator it did not fluctuate...


If the fuel pressure does not change when you disconnect the vacuum hose on the regulator, change the regulator (There is vacuum at the hose, correct?) Also, check the return line for kinks and internal obstructions.

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