check your fuel filter, its the most over looked part..

 

Im with you. bad coil or plug wire bad or loose.

 

His is in the tank. I doubt that's the problem.

Jim

 

mine did the same thing intermittantly, mostly at highway speeds. i noticed it only did it for a split second before the a/c compresor cycled. i took the a/c belt off and turned the a/c on to rule out an electrical problem, and it was fine, ran great. the compressor was going out and trying to lock up as the compressor clutch engaged, causing a bog/shuttering problem. replaced thecompressor and its fine. does it make a difference if the ac is on or off?

 

my 5.3 isnt running good either so im subscribing to this thread

 

have you tried cleaning the MAF? what do the plugs look like?

 

how do you clean the MAF? just a compressed air type cleaner like for computers or what?

 

is there any way to test if you have a faulty ignition coil? i assume those are fairly expensive to just go and replace, any one have a part number?

 

very carefully. take the MAF out, get a can of electronic parts cleaner that won't leave any residue, and have at it. if you want to get more into it, grab a q-tip and CAREFULLY swab the wires, just don't break them.

 

if you have a scan tool like EFI live, you can do a cylinder balance test. other than that, pull your plugs, all of them, and see what they look like. if you have one that is black, then it's obviously got a problem.