Erratic Idle When warm!
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Intermediate
Joined: Jan 2025
Posts: 47
Likes: 3
Erratic Idle When warm!
Hello all, Hope your vette’s are doing well! 
After running some errand yesterday in my 86 I noticed it was idling really weird, especially after I would let off the gas. I ran the codes and got 36 (Replaced the MAF with a delphi that doesn’t have the burn off circuit) and 44 which i know means I’m running lean. I’m confused because it only seems to do this when it’s warmed up. When cold It idles a bit more stable at about 700-800rpm, albeit with a little bit of a shake. I checked for vacuum leaks throughout the whole system and can’t seem to find any, but i’ll double check later. I’ve replaced a lot of stuff that might cause this if faulty such as: Brake booster, IAC, fuel pump, intake manifold gaskets, some old vacuum hoses, O2 sensor, Egr valve, fuel filter, fuel injectors, and a tune up including a cap, rotor, wires, and plugs
Im totally lost and don’t know what else I should check. So I would really appreciate any kind of input. I’ve even attached a video of the idle below to this post
After running some errand yesterday in my 86 I noticed it was idling really weird, especially after I would let off the gas. I ran the codes and got 36 (Replaced the MAF with a delphi that doesn’t have the burn off circuit) and 44 which i know means I’m running lean. I’m confused because it only seems to do this when it’s warmed up. When cold It idles a bit more stable at about 700-800rpm, albeit with a little bit of a shake. I checked for vacuum leaks throughout the whole system and can’t seem to find any, but i’ll double check later. I’ve replaced a lot of stuff that might cause this if faulty such as: Brake booster, IAC, fuel pump, intake manifold gaskets, some old vacuum hoses, O2 sensor, Egr valve, fuel filter, fuel injectors, and a tune up including a cap, rotor, wires, and plugs
Im totally lost and don’t know what else I should check. So I would really appreciate any kind of input. I’ve even attached a video of the idle below to this post
