I have a 2004 Toyota Solara 4cylinder....when I'm driving my car accelerates up and down at times... I had tuneup and the oxygen sensor change and my car vibrates when the AC is on...
Have your mechanic check your engine mounts. They may be cracked. Also make sure the idle is at 1 RPMs when in Park. It could also be a bad a/c compressor.
Thank u for ur feedback..top mount was cracked so had all mounts replaced...when a/c kicks in that's when I feel the vibration...found out that I have a slow leek(rack and pinion)...I makes a little noise along with the vibration so when I adjust steering wheel it stops but quickly starts back up...
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