I have a 2002 twin turbo gt. I cant get it to start. it cranks and turns over for a like less than split second and dies. It backfires every once in a while if you hold the gas down.

Ford has replaced my pcm 2 times because they said there was a loose wire due to someone changing the odometer, but they said they fixed that issue which was causing the pcms to blow. I got the car out of the shop and 4 hr later it stopped running. I went inside a store came back out and out of no where the car doesnt start... it was running perfect when i got it from ford.
took it back to ford and said the new pcm is still fine (they said looks like it is in the engine wiring harness may have a short) but they wanted $3000 for the job and i was "not happening".

-Fuel fileter was changed 1yr ago
-new iac
-new tps
- after market tune to eliminate the o2s (no mid pipe, open headers)
-after market tune has pats turned off
-Fuel pressure gage reads 40lbs
-alternator tested out good
-battery is still good


anyone have this happen to them? its driving me crazy? maybe some punks put water in my tank? or too much injector cleaner? something seems to be cutting off the spark bc it cranks and goes vrooooommm and dies out immeditaly. any ideas?