stangcoupe1970

Okay, so I'll go ahead and change that tomorrow, if that isn't it would it still be beneficial to the car?

cliffyk

The EGR injects smallish amounts of exhaust gas into the intake, to cool the combustion temperatures (already burned exhaust gas cannot burn again) and reduce nitrogen oxide emissions.

It only does this while cruising, and at lesser throttle openings (the situations under which you are experiencing the misfires). The cooler combustion temps allow a bit more aggressive spark advance.

It is of course not possible to make a 100% certain diagnosis without having seen, heard, and smelled the car--however my experience has been that the subtle misfire you describe is caused by one of two things.

1. The EGR valve being sluggish;
2. Removing the MAF screen;

As I typed that I went back to look at your signature, and see you have a CAI--did you remove the MAF screen? More about that here...

stangcoupe1970

The MAF screen is still in place, and so far so good after the EGR change, I mostly felt it at 40 mph so I'll see tomorrow when I go to work.

cliffyk

That's about where mine was most noticeably acting up--how was the tube to remove, the can be pretty easy or a real bear--never in-between...

stangcoupe1970

Wasn't too bad with the penetrating lube I put on yesterday just used an adjustable wrench and gave it a tug, then I turned it out by hand. Only took me about 10 minutes.