What do i need to know when changing a throttle position sensor on a 1984 cadillac coupe deville

I found this picture, if that is correct? Probably a three wire connector, ref voltage--ground--signal. I did see another picture, I wasn't sure? This picture said dfi.

Empty the gas tank, fill with good gas.

most likely a bad throttle position switch or an vaccum leak. try spraying all hoses and the intake with carb clean if the rpms change that object needs to be repaired

check wiring u might have a wire rubbing some wheere

I A C motor small part on throttle body ,controls idle mixture when they fail at idle the engine "hunts" for proper air/fuel mixture . when defective it causes o2 sensors and TPS to compete to set an idle thus the up n down effect.. auto wreckers if your broke new from your local parts store....dealer to much 1 plug in two bolts for most applications

Fig. 31: Vacuum circuits - 1984 V8 4.1L engine Fed. and High Alt. (DFI)

Fig. 33: Vacuum circuits - 1984 V8 4.1L engine Calif. (DFI)

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Jose.

run the fault codes and check for a problem reverse servo/solenoid

could be either, you need to see it on a hoist to locate exact leak,

try the fuel pressuer regulator

it is a 20 amp fuse located on the right side of the fuse block. it is marked stop/hazard just above the the green 30 amp fuse. i hope this helps you.