Had my street car out last night mashed on it from a roll, shift light came on for 2-3 and pow. Motor tries to fire it cranks and if you give it gas while cranking it will start than immediatley backfire. Just got car back from dyno yesterday car made 587rwhp at 25psi with 25degrees of timing and 11:4 A/F reving car to 6500. I dont think I broke the crank, or a piston I was thinking broken plug, cam sensor, crank sensor, or MSD.