When car is warm and gas pedal is fully depressed,
RPMs climb to 4000 RPM then immediately fall to 2500, then climb back to a maximum of 6000 RPM--all without changing pressure on the gas pedal. We have replaced the ignitor and the distributor recently. If this was shown on a graph, the line would be jagged instead of a constant slope. This car has a ton of vacuum hoses. Thank you
These symptoms point me in 2 directions.
The first would be the gas filter. I came across the same problem this week on a 1996 Corolla. It would hesitate and sputter while pressing the throttle. The cause was a clogged gas filter.
The second area I would check would be the catalytic converter. If it is partially blocked it could cause these symptoms.
If there was a vacuum leak large enough to cause a problem you would be able to hear a hissing or whistling noise from the engine at idle.
Post back with any new info and hopefully we can pinpoint the trouble.
Good luck.
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