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hi i got a 99 gmc surburban its got 103k miles on it and the car started to like not idle right it would shack every so often like vibration
so i changed all the plugs wires distributer cap rotor
and my surburban is a 2500 slt 4x4 its got a huge 7.4 liter engine its a 454 and after all that its still not idleing right
power is there though
and iam woundering what type of surburban do u have cauz u have such a good mialage
mines mialage is like 10-11 mpg
thanks alot
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