Ok, Question From My Friend..

[Khadgar]

My friend says he's tried askin at TCstangs but no one gave him an answer on what it could be. Anywas he has a 1995(maybe 94) GT 5.0 mustang with basic mods, intakem, exhuast, underdrive pulleys etc..

A few weeks ago he went and changed out most of the ignition stuff, wires, plugs, distrbuter thing, and it ran fine for a day or two, but now the car stumbles/backfires.

From what I've seen if you sit in netrual and try revving it, it will rev up to ~4k and then it starts to stumble and backfire and it can't go any higher, I guess this is how it acts also while driving.

I know this is a DSM board but, any ideas?

[LightningGSX]

Probably incorrectly gapped plugs or just shitty replacement plugs/wires in general

[Khadgar]

I told him to check the gap and firing order and he said it was all good, I'll probably just have him stop by and check it all myself.

[LightningGSX]

I suppose it is possible its something else, and it coincidently happened after doing a tune-up.

[Khadgar]

It sounds like spart either way I think.

[MatriX]

If all eles is correct from what eveyone eles has posted, Maybe watch TPS voltage too see any unwanted Flex in that.

BTW. Any DTC's?

[Khadgar]

yes, but I think he said that checker said it was EGR

[MatriX]

Did this DTC show up at the same time the Cars current problem did or was this light just put off for awhile

[Khadgar]

Around the same time I think, he said he brought it to the dealer but they didn't know what it was

[Khadgar]

No DTCs at the moment, Ill post a vid in a sec

[MatriX]

Not sure if you already said this, but does this Miss/orStumble issue seem to be Evan, or does it seem to get a little worse when driving it underload, rather then just reving it up.

[Khadgar]

Yes it does, it will creep up to redline but its slow and sounds all rumbly imho

[Khadgar]

Here is a video, you need quicktime to view it I think

Mustang video