Hi everyone.

My SES light came on, car starts hesitating about 2k rpm, once over 3000 rpm it smooths out. When scanned at Autozone they said both pre-cat o2 sensors were sending a low electrical signal - I replaced both.

This didn't make any difference...I went back and they reset the computer and said the engine was running lean?

Any ideas???

Thanks!

 

any mods to the motor?? how many miles on the car?

 

70,000 on the engine, stock other than a lid I put on at 30,000.