miss at 65 mph

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  #1  
Old 07-19-03, 11:41 PM
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miss at 65 mph

Sirs:

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?

Thanx
 
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  #2  
Old 07-20-03, 08:08 AM
Joe_F
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When's the last time it saw a tuneup? Start with my "The Basics" post.
 
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