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I found the problem. It was a cracked spark plug, which makes sense since the car would start running like crap the warmer the engine got. I am sure the crack in the plug would get bigger as the plug warmed up. I got the engine warm then disconnected the fuel injector electrical connection and I fou...

try unplugging the O2 sensor and see if that makes a difference. If it does, it needs to be replaced. I know it's kind of stupid, but is it possible the spark plug wires aren't lined up in the proper cylinders? Maybe your timing is off? I checked the spark plug wires and they are lined up correctly...

shameem wrote:Are you getting any engine codes (code 16?)? Did you seal off any vacuum lines near the airbox?

To be honest, I have no idea how to pull an engine code on this car, and I have not sealed off any vacuum lines. It ran fine before, now all of a sudden, it started running rough.

I need help! I have a stock 1994 4 cyl with about 122,000 miles. Here is what is going on: car runs great until it starts to warm up. The warmer it gets, the worse it runs, feels like it us running on 3 cylinders instead of 4. Idle is rough as well when warm, and hesitates on acceleration although e...

I have been meaning to reply to the helpful tips. It was the bulbs. You guys saved me lots of time. Thanks!

I did not try the bulbs. I did not think both bulbs would burn out at exactly the same time. I was thinking maybe it was some kind of low/high beam switch or something. I will look at the bulbs and see if they are bad. Thanks for the info.

I have a 1994 MX-3 with a 4 cyl. I have done no modifications to my car-yet. Recently, my low beams quit working. One day they were fine, the next day, nothing. I have to drive with my high beams on(good thing my lenses yellowed out). Any ideas?