Yea often its the simple things people over look like belts ect... Check the belt tension/condition. Because as you increase speed the demand for more power increases. Your spark control systems need more power. Fuel system and so on. Also check your battery/battery terminals are in good order as a dodgy battery won't be holding very much charge. You can do this with a Voltmeter with a 12V setting. Its a process of elimination... Good luck.
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Sounds like the deresonator has a crack in it, unhook the battery for a hour system will reset easy replacement. then go to the local auto parts store, check for codes. you probably need camshaft position sensor
Disconnecting the battery should reset it but I would bet that the light will come back on. I would have a auto parts store read the error code for you. They can also reset it. There are two o2 sensors on this car one on the manifold and one down stream from the converter. If you are getting an o2 error code it could also be the converter.
unhook your battery for several minutes to reset the light. if it comes back on theres a problem somewhere. also advanced auto parts can hook up a scanner to tell you why it's on and they can also turn it off at the same time free of charge
When you have a list of codes like that, it is usually due to charging system problems (computers doo all kinds of crazy things when they are getting delirious from malnutrition). I would be performing a THOROUGH check of your battery and charging system before doing anything else to try to diagnose this problem.
Unhook the negative side of the battery for 15 minutes and it will forget the code and relearn all parameters. It'll run and shift a little funky until it relearns. If your radio has a factory code lock, be sure to write that down before you unhook the battery or the radio won't work.
You should not reset the ck eng light until you have repaired the problem. Its just going to come on again, unhooking the battery MAY reset it. To reset the change oil light, turn the key on and floor the gas pedal 3 times, that should reset the light.
unhooking the battery won't clear the code it's still stored in the hard set memory go to shcucks and have them scan the computer ask them to see if the codes are cleared if not you can clear them they can't it is an OBDII car once you have cleared the problem drive it and see if it comes back, be sure to get the codes printed out before clearing the codes the mechanic will need them if it comes back, there are hard codes and soft codes soft codes can be reset by unhooking the battery but not hard codes. Don't bother with unhooking the battery.