starts up, drives and shifts fine when engine is cold, but when it warms up, the fan turns/stays on. then i'll accelerate normally and it'll bog down or stumble/hesitate, then shift too early into 2nd gear and continues to upshift early..also have intake manifold cracks, one by thermostat thats leaked around ignition coil and one that leaks into coolant temp sensor..i know i need a new intake manifold but could these leaks be the problem or maybe theres some bad sensors??
-Most appreciated