My 1.8 turbo car with LINK ECU started running real rough at idle but cleans up at operating temp or when cold above about 3k rpm.
I pulled plug wires 1 at a time and it seemed to not change when the skip when I removed wire #3.

This is getting progressively worse. Last night, it would not start once it got to operating temp. I waited until this morning and it started right up....still with the skip but it started.

I was thinking spark plug or injector. Any thoughts?

 

What head / lash adjusters do you have? When was the last time you adjusted your valve lash?

I ask this because this was one of the symptoms that presented when I had a failing intake valve. Car ran very rough when cold until it warmed up. When the valves had worn enough that when they were warm they were still leaking.... thats when I knew I had a real issue.

Could be any number of things....and this is probably the least likley.....but younare looking for ideas.....so there is an idea

 

Thanks TNTUBA. I hope this is not the issue.

 

Any other thoughts? I replaced the spark plugs and it is better but not right. The missing seems to go away above 1800-2000 rpm.

 

Well, the next step could be to swap injectors, although it does not probably explain why it runs well on higher RPM. Is the air/fuel ratio OK on idle and at 3k RPM if you turn off the EGO corrections?