wrote:
>
> Just found this problem, engine light on showed a misfire. Had shop
> double check all of the injectors and fuel pressure, all good. Install
>
> a new fuel filter. Then did a new plugs. Thought it might be a spark
> plug wire, installed a know good one, no fix. Then swapped with the
> one next to it, still no fix. Replace coil, no fix. Replaced the ICM,
> no fix.
> Thought this could be related to the plenum problem noted here, not the
> issue, the engine is not using any anti-freeze.
> Tonight, I listened to all of the fuel injectors, all sound good.
>
> Can a timing chain cause this kind of issue? It has never been
> replaced on this car and it has 165k miles on it. However, why just #4
> misfire. Overall, the engine runs great at highter speeds, only
> misfires at idle.

Timing chain won't cause just one cylinder to misfire.
Instead of randomly replacing parts, you should find the root cause.