72chevy2door
Full Access Member
- Joined
- Mar 19, 2014
- Posts
- 193
- Reaction score
- 24
- Location
- Florida
- First Name
- Jeff
- Truck Year
- 1988
- Truck Model
- 1500 Sierra Classic suburban
- Engine Size
- 350
Hi guys I'm new to this forum and would greatly appreciate y'all's help. I own a 1988 gmc 1500 suburban. It has a 350 small block with tbi injection and a 700r4 transmission. I just did a fresh rebuild on the motor built it completly back to stock other than the camshaft, timing chain, and long tube headers. The camshaft is a speed pro cam part no. CS-1014R. The timing chain is a cloyes heavy duty double roller. The headers are hooker headers competition darkside part no. 2452-3HKR with 1 5/8 primaries and 2 1/2 collectors. The problem I'm having is at first start up it runs fine then after about 30seconds it starts to backfire. The backfiring is only conning from the passenger side exhaust. I'm sure I'm not the only person with this set up so if someone can help me with this I would greatly appreciate it. Thanks