bought my jeep last november is a 2000 wrangler se 4cyl 4xr used and loved it! but didnt know there was something wrong with it until now my radiator blew and barely made it home, checked it and there was corrosion in the water, anyways changed radiator thermostat hoses and water pump the problem was the water pump the blade was gone! well after fixing it , i tried to start the car , it did but the rpm went crazy to red line! thought it might be a sensor , checked it with a obd II reader there was no code, either way i changed every sensor speed, idle, crankshaft position , throttle position and still does the same, when ever i try to start the engine rpm goes crazy. could it be a blown head gasket since i saw oil inside the intake manifold? i need help so i can at least have an idea of what its goin on. i bought the car with my credit car cus i needed a car and still owe money dont want to spend more than i already did. cus it seems im paying more that what the actual car cost.