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haven't changed cap and rotor or plugs and wires but i will today that was my next step. It has 155,xxx i just bought it 2 weeks ago. I will also check the distributor gear.

I have a 96 yukon w/ a 350 vortec and my prob is when I am cruising at about 60mph on up the engine stumbles and it only does it at 60mph and up and only if you are steady on the throttle if you give it a little gas it goes away. I replaced fuel pump fuel filter cleaned MAF, and changed tranny...