So i have a 1995 Mustang Gt with the 5.0L. For awhile now it seems that i've been getting a CEL SOMETIMES when i get between the RPMs of 3-4,000. I have a buddy next door that tells me it could be an oxygen sensor. I doubt that's the case cause when it happens i feel something weird in the shift ? Not sure how to explain it, as in the transmission is trying to shift properly. Seems to shift pretty hard. I check the timing and it was actually 5 degree's off, fixed it then a few weeks later because it seemed to stop after i fixed the timing. then it came on again thinking it might be the timing again. Just check it again the other day and it was fine maybe thinking that the timing chain was coming loose which could possibly making the light come on. I'm now lost.