01' m6 ws6 47,000 miles,

Car idles rought--meaning shakes when at idle, and jerks while driving, you can feel it alot in the shifter.

I am running out of options here, would a bad fuel pump cause this problem, or something to do with the coils? How do I test these? Fuel filter new, fuel injector cleaner used twice, unplugged MAF and it did not really idle much different and strangly enough set know code when I did that, think my plugs & wires are good--changed recently, had a buddy use a computer to look for codes-none recieved and he tested the wires which were good too, I tried looking for a vaccum leak but I spray on a bunch of hose on the top of engine but don't hear anything. I hate to take to a shop for a "I don't know response" and a still pay for a look at.

Somebody help me through this, its really annoying to drive

 

You unplugeed the MAF and there was no change?
Try a different MAF.

 

Yeah I unplugged the MAF and there was no change, so then I went to Autozone and got one there and put it in and there did not really seem to be a change either, hard to tell but it was still vibrating, but the thing is the one at autozone was too small, I was like what the, so I returned it, would the fact that the MAF from autozone that I tried was too small in diameter give me a inaccurate test here?

I heard that the coil packs or a fuel sensor might be the problem, can anyone give me more info on how to test the coil packs, and where to find the fuel sensor if there is one?

Thanks