Forgive me if I just couldn't figure out the search function, but I tried to no avail. The title pretty much explains it. Although the AC works quite well, as long as it's running I get a constant feeling of misfire from the engine, regardless of speed. Curiously, it will idle just fine, the hesitation only happens in motion. I just swapped out the spark plugs with the motorcraft platinum, made no difference. I'm hoping for some diagnostic advice because I'd like to fix this, but my old strategy of throwing parts at the problem until it's solved, though effective, tends to be costly. It's a 97 stick shift with 184k miles.