- Joined
- Feb 14, 2016
- Messages
- 524
- Reaction score
- 2
- Location
- Clover
- My Car
- 72 Mach 1, Q code 351CJ, 4 speed.
I got the intake gasket replaced and made sure it doesn't leak. I put new plug wires on and made sure they were routed to the proper cylinder. The car idles good but has a miss and a backfire when I rev it up. Where is the first place to start troubleshooting? A friend said that a backfire is either timing or a vacuum leak.