(I originally posted this in V-6, but meant to post here).

Recently purchased a 1985 Camaro 2.8L TBI. Car was parked for a couple of months as it started to sputter and backfire thru TBI. Idle seems to smooth out at higher RPMs. Drove it home without too much problem. Haven't dug too deeply into the car yet, but I recently discovered that when idling for a few minutes and with the car backfiring at times thu the TBI, the cat converter was glowing red hot.

Could this be cause of backfiring (clogged cat) or effect of backfiring (too lean)

Thanks.

gene

 

Unbolt the cat from the y-pipe and run the car. It will be a little loud but if the car runs normal than you can assume it is the cat. I would also have the timing checked. Backfiring through the TBI is an alarm for bad timing.