My 99 Yukon it first start shaking while in drive but stopped. Then it just started shaking while in park and while driving. I had a cell when i went to get a checked it was 2 O2 sensors and a 4 cyclinder misfire, so i got 2 O2 sensors and changed all spark plugs and wires. And that didnt fix the problem.
Anyone have any ideas?

 

does it have wires or individual coils? if individual coils might have the one on #4 going bad

 

naw they have a distributor and separate plug wires. id try a compression check. id really have to see the truck to be able to diagnose it correctly. the vortecs can have a few different issues.

 

You might try a new distributor cap and rotor. I've always believed that when you do plugs and wires, then do distributor cap and rotor, too.