If you have a fuel pressure guage, check to make sure the fuel pressure goes up when you remove the fuel pressure regulator vacuum line at idle. If the pressure does not go up, check for possible vacuum leaks. If there are no vacuum leaks, then suspect the fuel pressure regulator. Another possibility is a bad injector, or bad O2 sensor giving false feedback...
Make sure the connections to ACT (Air Charge Temp) in the #5 intake runner is OK. Check the connections for the ECT (Engine Coolant Temp) in the heater feed tube by the alternator to see if they are OK.
As for the ACT sensor, you can ohm it out in order to check its functionality. If its resistance is infinity, you can assume you'll need to replace it.
What happened? I only power washed the engine, Did I do damage to it?
But this didnt happen dirctly after the wash so it couldnt be that
I also dried the engine with compressed air too
and it ran fine
It still runs fine,
just the dam check engine light
check your O2 plugs and see if they got water setting in them maybe causing false readings.
reset the eec and see if it comes back.
if you dont have a fuel press guage how do you know it was ever set right?
Did you pull the cap and see if it has moisture in it causing a misfire?