my problem could be a air charge temprature sensor not the ect sensor, since both work hand in hand, I am now having to mash the gas pedal to the floor in order to get this truck to run, it spits and sputters for about 30 sec and then clears out and runs great. the error codes of 51 and 21 are still there, reading here it seems that it could be this air charge temp sensor...any ideas?

good camping to you.

 

It depends on what motor you have, but it's in the intake path close to the fuel injector. On my 300, it's in the #1 running about 4 inches behind the injector.

 

1988 ford f150 4x4 302 (5.0L)

 

Its on the drivers side of the TB. It has a wire going to it..I forget the color. Go to a dealer and ask them to give you a printout of its location. THe dealers here do it without asking any questions.

 

Replace the sensors giving you the error codes.

 

replaced both sensors, the ACT was caked with oil and grime and almost plugged...replaced the ETC and runs pretty good. Thank guys...
Good campin' to ya'