98MustangSTL

Did anyone who did the PI Swap notice afterwards that their car was kind of missing at 1/2 throttle, etc?
I'm think it might be because it hasn't been tuned yet and the bumped compression, but I'm not sure. I set the timing marks up right, the car idles fine, and drives fine until I start to get into it a little bit.

Kevin.

karmstrong_2

Are you sure it's a miss or just the cams lobing a little bit. Mine does the same thing since I put the cams in but I'm thinking it's them lobing. If anyone else knows better or has had similar experiences let us know for sure.

karmstrong_2

Oh wait never mind...I just saw where you said it ran fine until you got into it. Mine feels like a miss at idle not when I get on it

andy98gt

Anyone else notice the significant power gain or was that just me to?

98MustangSTL

The car feels quicker, but when I try to get on it a little bit...it misses. Or that's what I think it does.

Any input would help. I was just going to take it up to the tuner and go from there...

II 98 GT II

What about plug wires? When I changedthe intake manifold on my old 98 GT, it did the same thing that you are describing until I changed the plug wires.

98MustangSTL

I'm running FRPP 9MM. O man, I think I know what it is. I'm re-using the plug wires from before. They only had about 10K on them, so I figured I could re-use them. Alright I'll replace wires and take it from there.

96GT226410

I wouldn't replace the wires so soon. I used my old wires that have about 25K on them when I did my PI swap. After the swap I noticed my car idles funny, but that's it. I need to get it tuned, though.

Chris98Gt

I used the old wires and they had like 100k on em and they were fine, my car idled wierd for a bit till the computer figured out what was goin on. After I went to the store and a friends house it was fine before I got a tune. Idk why it would feel like its missing at part throttle. I would assume detonation atWOT but not part, idk. What about the plugs themselves, do you have new plugs or recently changed plugs?

98MustangSTL

Yeah the plugs are brand new, so I don't know if that'll be the problem.

I want to say it's because the car now has bumped compression and needs to be tuned...but if no one else had problems like that then I'm not too sure..