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incomplete tune up.
go pull codes at auto parts store then probably plug wires, fuel filter, air filter, pcv valve, the coilpack may not show on results just a misfire so the timetable is right for a cooked coilpack
Sounds like you have a vacum leak. Trace the vacum lines under the hood to locate broken or uninstalled vacum line.You can always spray a little brake cleaner in suspect area ,and if the idle goes up, you are close to the problem. Even a intake gasket leak will cause high idle
You will need to play with the idle air control motor or adjust the throttle cable. Lots of times when the vehicle idles to high there is a vacum leak or broken rubber hose sucking in excessive air. To find it you can take throttle body cleaner and spray under hood. If the idle bogs down then you know you have a vacum leak that needs to be repaired.
Sounds like a broken or torn vacum hose, pcv valve clogged, or bad Idle air control motor. Did you spray carb cleaner on vacum hoses or near the plastic intake., and did the motor rev up or down? Those codes represent a lean condition which means most like a vacum leak or clogged idle air motor. Sometimes the intake manifolds crack or the intake manifold gaskets crack. FInd that vacum leak or inpect iac motor
Fuel injectors go bad on these engines, you can find re manned ones for 30 bucks. If you have an engine light on get that read. Change your coil/wires/plugs also. Is the lower intake manifold gasket leaking coolant yet? You may want to get that replaced also. Check the TPS too (throttle positioning sensor) those will also cause your engine to act up
sounds like you have a vacum leak in one of the vacum lines or you need to change the idle air control valve. start the engine and raise the hood and lisen for a vacum leak and check all vacum lines for dryrot. if no vacum leak can be found then replace the idle air control valve, this controls your idling
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