hey all, I'll start by apologizing for writing so much but I am trying to be as specific as possible as I want to kill this problem once and for all. I've been having a misfire problem with my 97 GT for the past few months, and everything I have done has done nothing to solve the problem. Here are the symptoms: -Loss of low end power -No longer pulls well at the top end (used to pull decent with PI manifold on) -A distinct misfire under load, usually at low rpms (most notably at ~1400, but does it all the way to 2000 or so) - car shakes me a good bit -This may be the way mustangs are, but the idle doesn't seem very smooth as I can hear "blip" noises from the exhaust -Occasionally, when I stop at a light, the RPMs will drop to 500, go to 1000, and follow a sine wave of sorts for a few seconds before idling at 750. -There is no sign of detonation/pinging (so I don't think it is fuel pressure related) -Car throws no codes Here's what I have done to try and fix it -Tried new Autolite AP764s, then replaced with copper 764s -Changed fuel filter -New IAC, new DPFE (EGR controller) -Cleaned MAF twice with electrical contact cleaner -Checked all vacuum connections, tightened intake tube -New PCV -Checked torque on the intake manifold - it was fine -Thinking that the "misfire" feel was my clutch slipping, I had a new clutch/flywheel put in Possible sources: -Plug wires have only about 15k on them, but I was thinking they are possibly the culprit? -Coil packs are stock as far as I know, and unfortunately I don't know any place around here that will test them -Possibly a weak alternator output isn't giving enough juice to the ignition? -Gap is fine on plugs, but maybe the car will only work properly with Motorcraft stockers? -God hates my car and doesn't want me to be happy with it? haha Thank you all in advance for any help you can give. As you can see, I have been wrestling with this beast for some time, my mechanic says he can't feel it but I definitely can - as he explained to me, if he drove the car every day, he would know what squeaks, rattles, etc were just part of it being a 9 year old car, and what was something new/problematic. The thing that stumped him was that there was no code being thrown. Any help is greatly appreciated, and sorry again for writing a book!