well my buddie helped a guy install a TSP 408 iron motor in his 01 truck.
problem is the truck wont run, all it does is pop and back fire. we found NO spark on 1 7 4 6 the others have spark. any ideas. thanks

truck ran great before but now since the motor nothing

my guess is a reluctor wheel wheel problem, either to much runout or to much crankshaft endplay.