HESITATES AND STUTTERS AFTER WARMED UP

1999 Toyota Avalon

Tiny

Anonymous

March, 2, 2013 AT 2:32 AM

Hesitates and stutters after warmed up. When first driving I can press the accelerator as hard as I want and the car will respond well - no hesitation or vibration/shaking. After a couple of minutes (warmed up) when I press the accelerator the car will stutter and vibrate. I have to press the accelerator very slightly to increase speed. This is a problem when trying to merge into traffic and happens at any speed. The tach seems to show rev's OK. I can put it into neutral and hit the accelerator and it will not stutter or vibrate. I have already replaced the MAF sensor, SeaFoamed the throttle body, took the EGR valve and manifold off. I cleaned the EGR manifold and tested the diaphragm - it will move under vacuum.
What next?
Thanks

FOUND 2035 RELATED QUESTIONS

Egr Valve

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Tiny

ASEMaster6371

March, 2, 2013 AT 3:33 PM

How about basics like plugs/coils/wires? How old are they?

Roy

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