98 yukon

Asked by Oct 07, 2017 at 04:52 PM about the 1998 GMC Yukon

Question type: Maintenance & Repair

I have 98 yukon that missfire after it warms up i
push on throttle n truck doesnt want to accelerate
it stalls n shakes..change spark plugs n wires
replace air flow sensor change rotor and
distrubator and still acting up any advice would
help..

1 Answer

163,275

Run a fuel pressure and flow test, if it fails replace the fuel pump, fuel filter and fuel pump relay. If no problem with the fuel pressure then the Spyder injection is the next most common failure, I had a problem with my old Tahoe with one injector leaning out during full operational temps, I was able to correct the problem by filling up with Chevron fuel for about 3 tanks and then went back to my regular fuel supplier and putting in a bottle of Techron in every tank full, ran it that way until I sold it, otherwise I would have had to replace the entire Spyder system, and that's not cheap. You may want to consider getting a live data scan performed also, you may have a sensor misread fooling the computer, ACT, ECT, TPS can cause your symptoms too. HTH

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