I bought a 1994 mustang gt a few years ago and the check engine light was on. It runs good most of the time but sometimes it won't idle right. I have a few ideas of what it could be wrong but not sure. For some reason it has the obd1 and obd2 hook ups but neither one works because some genius tried to hook up a keyless entry system on it at some point and did a horrible job. Not sure whether I need to try to remove the keyless entry system or if there is another way around it to get the hook ups to work. I would like to know for sure what's wrong before I start buying parts.