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Hey DonAld, these are not hard to replace..( I do not know which engine you have..it makes a difference!! ).. take a PICTURE of where the current TPS os positioned and located... the radial (adjustment) location IS critical!!.. here is a link to Autozone, ...O'Reilly's, and Advance Auto should have one too..
There are to many variables to give a definite answer here. You will need to hook up a computer scanner to the car, to check for fault codes and to watch the PIDs [live data sent to the engine computer from the various sensors.] That said, the most likely culprits are either a bad TPS [throttle position sensor] or a failing fuel pump.
A strong possibility of a defective Throttle Positioning Sensor (TPS)...It can be tested with a volt meter...TPS is located on the throttle body (see diagram below) & has a three pin connector with following wire colors; Brown (ground)...Yellow (+5 volts)...And White (TPS output)...Set meter to 5 volt dc...Push point,of safety pins into the Yellow and Brown wire at rear of connector...Do not disconnect connector...connect + lead to Yellow pin and - lead to Brown pin...Turn key on...Meter must read at least .08 volts...Open throttle full...Meter must read at least 4 volts...If not TPS is defective...Send results...NOTE>>>Diagram is based on a 2.0L Single Overhead Cam Engine, if your vehicle is different let me know...saailer
Sorry your rebuilt trans did not fix your problem P1120 is TPS out of range The throttle position sensor responds to the gas pedal movement . of speed and angle it is moved Most sensors are 3 wired which has a supplied voltage of 5 volts and a ground and a signal return voltage this signal starts around .5 volts closed throttle plate and slowly works to 5 volts at full open position with a volt meter test the return signal while operating the throttle plate (engine off key on) look for glitches is voltage span go slow if this test fine check at computer the wire can be broken somewhere.
I had to change mine , the part cost around $200 and for me , my sensor was firewall mounted so it was easy to do myself, two screws,two vacuum hoses different sizes and three wires. I suggest doing research on line regarding the sensor and where it may be on your car. I have a 01 Focus se 2.0 spi.
I am always telling people to obtain their own HAYNES repair manual due to the $$ that could be saved by doing some things yourself, or at least having some knowledge so some mechanics won't think you're an easy cash grab. Some mechanics tell me the book is **** but that is not true; it's always better to know how cold or hot the water is before jumping in....right.?!
I don't know how many miles you have or the condition of the car, but it sounds like it might just be your TPS (throttle position sensor) might be bad as well as the throttle could be sticking open and just need to be cleaned. Find where the throttle cable goes to the intake and just take some spray injector cleaner or something of that nature to clean the throttle plate. Start with the latter first.