I have a /95 tsi awd that i put a brand new longblock into. I did the 6 bolt swap and after a long road got it started... but after 4 miles the flywheel fell offdue to incorrect bolts, they were slightly too short. it sat for while till i got around to replaceing the TO bearing and cluthch disc. PRessure plate and flywheel looked fine. got it all back together, again, and this time i have the no start. I have 155 compression all the way accross, i have new plugs, correctly gapped with new wires. i am getting spark for all four cylinders. looks maybe just a little weak, but overall ok. i have 45 to 48 psi in the line from the filter to the rail, which is slightly high because of the 255 lph fuel pump. new FPR. New starter. new alternator. all electronics work. new battery and cable connections.fresh oil and coolant. correct base timing. the engine rotates fine but will only fire intermittently with a backfire every now and then. im stuck... Suggestions?