First off, thanks for membership to the group. If I have posted this thread in the wrong place, please accept my apologies and I will move it to the correct place.
I've got an issue with my 06 GT. I installed a Roush supercharger kit 8 years ago and its been great.
Problem is that when hot, and only when hot, and only during startup, the engine will stumble, misfire and sometimes even die (right after startup). I will start the car and it will do its initial rev-up right after ignition, then in about 2 seconds, it will stumble and fumble for about 5 seconds, during this the rpms drop to almost nothing and it seems like its only hitting on 3 cylinder, then it will catch itself and straighten out. Sometimes there's a little rough idling for up to a minute after then all is well.
On one occation, it kicked a check engine
light. I checked the codes: P0171, P0174.
I have cleaned the MAF and TB with the MAF spray cleaner. That used to seem to stop the malfunction for a week or two. Now it is continual, but only when the engine is hot.