C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1986 problem

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Old Mar 18, 2026 | 01:53 AM
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Default 1986 problem

My 1986 Corvette drives fine at first, but after a little bit the check engine light comes on and it goes into like a limp mode and will not go over 20 and when you give it gas it want to stall and back fire. If I shut it off for about 30 seconds and restart it, it drives normal again but then the same thing happens. It’s throwing codes 33 and 43. The light doesn’t come on right away, only after driving for a short time and the goes off when turned back on.
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Old Mar 18, 2026 | 08:01 AM
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Old Mar 19, 2026 | 11:30 AM
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Might focus on the code 33 first, have you checked for vacuum leaks or rips in the bellows ? Is tps voltage set correctly?
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