Check engine light

I don't know why but my check engine light is on again, i allready change the spark plus, the wires, the air filter and the fuel filter, everithing is stock, is a 98 talon esi manual.
1st I change the air filter, and reset the ECU, the light went off, but it turns on again after a couple of miles, the I change the spark plugs, and the wires, and i realised that i had water in the wires and plugs. reset the ECU and after 200 miles the light turns on again.
Finally I change the fuel filter, reset the ECU again the light went off and after 400 miles it's turns on again :banghead: .
Well if somebody hava an idea let my know thanks.

since it's not instantanious and keeps comming back, I would suggest having the code read. Thats one way to find out for sure whats wrong. Go to autozone. they do it for free and can tell you the code. that will be one step closer to fixing the problem.

Thanks, i will go tomorrow

I have a feeling it is going to be "EGR insuffecient flow"