i just got the truck maybe a mouth ago. it was sitting for 4 years had a blown head gasket i pulled the motor and bought a parts truck and put the motor in my truck. it had 40,000 miles on it, it ran great til yesterday it started acting stupid. you can run it half throttle and when you give it full it falls on it's face and almost shuts off. what could it be i have put new TPS on, new coil, new fuel fliter, plugs. can someone help me please