Sry to post this but ive searched and havent found a clear answer...my car is just sitting at the body shop...it just got painted...he said he pulled the car out in reverse went to put the car and drive and the car just died! the car will start and stumble for about 15 seconds then shut off...with any kind of throttle applied the car automatically shuts off and sounds like it is backfiring through the intake...any ideas? ive tried diffrent chips, reset computer, changed spark plugs. i unhooked the MAF sensor and it didnt change anything..i have great fuel pressure (42 lbs) the fuel pump primes...i just want to get the car home!