Its a 93 eclipse with 1.8L and 5 speed. Cranks and runs fine, when you are accelerating or cruising at constant speed it will start missing on one or two cylinders, then go right back to running fine. So far I have changed the following trying to fix this:

plugs
coil
distributor
o2 sensor
fuel filter
put injector cleaner in the tank.

I have an aftermarket fuel pump and tank, which have worked well for about 15K miles so that isnt the problem. It does burn oil, but seems to clear up after it gets running. when its running right, its great, I just cant figure out what is making it run like crap when it does. Any ideas?

 

I didnt see wires on your list did you replace them too?

 

they are about a year old, I replaced them before all this started.

I'm thinking it may be injectors, can you clean these suckers out or what?

 

You can try cleaning them w/ fuel injector cleaner but idk how well that stuff works.

 

Just make sure you get new seals before pulling those injectors so you have them ready.

 

Check the spark plugs and check the Burn on the plugs and check the chart on how to read them. Any Haynes book has a pictures of different spark plug burn on the back of their manuals.

You get them on Pep Boys or on line. or post the pic here of the spark plug or plugs.

different burn has different meaning

 

Can you get the car to miss at idle? What brand of wires do you have?

 

It is running lean according to the way the plugs look. It is bone white, no trace of tan at all. I noted this when I changed the plugs. It will miss at idle, at speed or while accelerating, but not all the time. It comes and goes with no reason that I can tell. it'll go for 20 miles or so no problems, then it'll start missing all the sudden, then stop.

 

it can be numerous things man.....Carbon build up,Spark etc....

 

Hes running lean so I'd assume its fuel related. A spark issue would foul a plug out.

Try checking fuel pressure and see what it reads when its missing.