miss at 65 mph

Old 07-20-03, 12:41 AM
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miss at 65 mph


Chevrolet 454 cid with electronic ignition, 1991. When engine is cold runs perfectly. After engine warms up it has a serious "miss" at 65 MPH. Slowing down or speeding up will cause the engine to level out and the miss seems to disappear. I replaced the oxygen sensor a few weeks ago per a set code. There are no other set codes in the readout.

Any suggestions?

Old 07-20-03, 09:08 AM
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When's the last time it saw a tuneup? Start with my "The Basics" post.

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