I've been having a drivablity prob with my max, maybe somones had a similar prob. @ 3500 rpm's under a load in any gear the engine starts to hesitate and "break up". Feels like a bad wire would. I havent had time to look into the prob extensivly all I did was:
Fuel press test (while driving)
Replace spark plugs.
A/F guage reads rich under load so I know its not running out of fuel. I think it might be a bad coil. Just figured maybe somone encountered the same thing. Thanks in advance.