Originally Posted by bcredliner

You came here asking for help because you haven't been able to solve the problem you are having. You don't understand why the SAP can cause your issue so you have decided it can't. You have been going on guesswork and experimentation and that isn't working. Perseverance might get you where you want to go, but not logic.

There are several potential causes for a cold start miss. One is a bad SAP. I am positive that is the case and have personally experienced those symptoms that were eliminated with a new SAP. Sometimes the rough idle is readily apparent, sometimes the engine is running smooth but is tacking up and down so little you have to read it from OBC. Rough idle usually disappears in under a minute. The Sap doesn't always sound different than normal.

This is one of those parts no one wants to replace because of the cost so they choose to agree with so many that have justified not doing so even with input to check it out as the potential core issue. They take the position it doesn't cause any problems, only there for emission standards. You have my input, anything more is not going to make a difference, will just cause a debate like what is the best oil or whether or not to change transmission fluid. Always your call.

I can't be positive your issue is caused by the SAP but it is a logical course of action to troubleshoot the SAP than experimenting with changing values when you don't know what they should be or what the changes will do, You have error codes, produced to facilitate troubleshooting and a troubleshooting procedure. Just trying to help. Always you call.