A month ago my V6 4.0 began having harder than normal starting and idling rough. It would also cutout for a 1/10th of a second while driving highway speeds. The cutout is for a split second and only happens at speeds 55-60mph. I notice it more when in cruise control. My rpms dont drop when it cuts out, no check engine lights or codes (scanguageII).
I cleaned the MAF and throttle body and startup and idle seem to be better, but it still cuts out. I've kept my eye on the rpm gauge when it cuts out and engine doesn't seem to skip a beat. Someone told me it could have something to do with the transmission. Could it have anything to do with supercharger?
I also put in the walboro 255 pump upgrade - only couple thousand miles on it. Cut out also happens with full tank of gas, cold and warmed up engine. Also thinking it could be the throttle position sensor.