Gosh, I must have gotten a tankful of bad gas from a gas station on the Florida Turnpike (Shell). At least I hope that is what it is/was. Every time I stop at an intersection my RPM's will drop from 750 to 625 after about 15 to 20 seconds and the motor vibrates like it is starving for gas but never really stalls. I'm on my second tank since then with gas from a trusted gas station and this last time around I added some STP Fuel System cleaner for Ethanol gas. It seems to help some.
Has anyone else had this kind of experience or could it be something else that is causing the engine to shudder like that? Other things that I tried was taking it out of gear and putting into Neutral or Park but the engine vibration did not seize.
I have also purchased a VOLO V12 that I have not yet installed and I think it will change the fuel mapping to a higher idle which may help but I do not want to install it until I am sure that it will not just mask a problem that has a potential to get worse.