Originally Posted by lotsofspareparts

I finally sorted out the random miss my 5.4 has had since installation.

Using DAS 2 weeks ago, I discovered that I had a pretty significant miss on Cyl 7. It was to the point where there were times the engine would stumble taking off from a stop. I narrowed it down to the "B" ignition circuit by shutting off the "A" circuit using DAS.

I swapped the Cyl 6 and Cyl 7 coils (to rule out a potential ECU problem), and changed out the "B" spark plug on Cyl 7 which had a blistered insulator. Car seemed to be running better..... thought maybe the "B" plug had just crapped out. Only has 7,000 miles on it...... figured a $15 spark plug would last a little longer than that!!

Anyways, I noticed the miss starting to come back, hooked DAS up again, and the miss moved to Cyl 6. The coil was dying!! Swapped it out with one of the coils from the original 3.2 and no more miss!! It hasn't idled this smooth...... ever!! It's had a little miss ever since I installed the 5.4. I've replaced everything too.... Throttle body, MAF sensor, EGR valve (even though it's shut off), accelerator pedal, and searched and searched for a possible vacuum leak. The only thing I hadn't replaced were the damn coils!! On a positive note.... all of the engines electronics are new!!

Also went ahead and swapped out the transmission electrical connector thing today, the trans filter, and a new pan gasket (thank you FCP euro). SRT tranny only has 37k miles on it now and was surprised the connector was leaking as bad as it was. I heard from the owner of our local Euro shop that there was a warranty issue with them?

A few days ago, I went away from the Eurocharged tranny tune and loaded the VTech tranny tune from Poland. I like the VTech tune a lot better. It doesn't hunt around for gears near as much as the EC tune did.

Couldn't be happier with this car..... I never get tired of outrunning almost everything with it!!

Jared