I cranked up my car today after doing a heads and cam swap and at first it was driving alright, then it started to misfire at low throttle, now its so bad I barely got it home it limped all the way. There is also a ticking sound coming from underneath the engine that correlates to RPMs, Im worried it might be a collapsed lifter and thats causing my problem, or it could be a loose header bolt, but thats not as big of a concern, I REALLLLLLLLY neeed to figure out the misfire, can anyone guide me in the right direction; I HAVE to have the car driveable by tuesday night