While I absolutely love the GT350R, I’m pretty much at my wit’s end with this engine and the poor diagnosis being done by Ford. I’m not sure they (Ford Performance) know how to diagnose and properly repair the engine problems, which is really scary. Had 1st engine replaced after the first time on the track. No symptoms other than lost oil pressure, coolant temp too high and kaboom! There were no oil leaks and there was enough oil. Engine replaced under warranty. 18 months later, start experiencing some throttle hesitation at part throttle on the street, car won’t hold cruise control, and get misfire code. Take to dealer, they reset the code, test and nothing appears for about 6 months. Take car to the track, one of the coolant hoses comes undone due to improperly torqued clamp, shut off the car immediately, get towed to the dealer, they did a compression test and engine was ok. 6 months later, get multiple instances of throttle hesitation, won’t hold cruise control, misfire code. I take to dealer and per service bulletin, they replace the driveshaft sensor (which can come loose apparently). 2 months later, same issue, instances of throttle hesitation at partial throttle, won’t hold cruise control, get engine misfire code take car back to the dealer. They perform compression test and cylinder rings on 3 and 8 are bad. Engine #2 get replaced under warranty. Drive approximately 100 miles on the 3rd engine, get instances of throttle hesitation at partial throttle (4k rpm), with engine “bucking", won’t hold cruise control, and get engine misfire code. This is while babying the car at break in! Never have I experienced anything like this before in owning other high-strung performance cars that I track and this situation is getting extremely frustrating. The number of hours spent on this, back and forth with dealer, plus uber rides, test drives etc is no longer making this ownership experience fun for what is supposed to be my non-daily fun/track car. What is Ford missing when doing these engine replacements and making suggestions (albeit poor ones) to the dealers? The only things I can think of are replacing throttle body, the ECU, or maybe the manifold (the Charge Motion control valves). Any advice (online or PM) is appreciated. Thx.