buddy too the truck to autozone cuz it was running rough, they unplugged the map sensor and it smoothed out and ran fine, so they plugged it back in, and as my buddy went to leave the truck died. will not restart, tries to fire every once in a while but backfires alot, i have replaced the cam sensor so far and have the crank sensor im going to replace shortly, was just wondering if there was anything else i could look into that would cause this. after replacing the cam sensor it backfires more often when trying to start

 

Did you make sure the hose to the map sensor did not come off or is fully in place?

 

ive checked all the hoses and wiring, did not see anything unplugged or out of place