SR has starting problem

[TougeChallenger]

Hello, my SR has a problem starting even when its not cold. and i cant figure out what it is. it use to start no problem when i swaped it in, but it got worse. It takes like 5 min just to start the car when its cold and when its warm it will only start when i give it some gas. It will not start at all without pumping the throttle. I was think it could be the FPR,bad timing or something to do with the fuel system,like bad fuel filter or somthing. So if some one whould give me some pointers i would really apreccaite it.

[NISTECH]

When starting a engine the ECM looks at coolant temp to determine the proper fuel mixture for the temp the engine is at. If it sees a extreamly cold condition it will give it the richest possible mixture for maximum atomization of fuel it can get since fuel wont ignite as a liquid. The colder the fuel is the less it will atomize so it needs more fuel to increase the chances. Now if the coolant temp sensor says its - 40 degrees in the engine [typical failing CTS reading] The ecm is gonna open the injector pulse width to somewhere around 50ms dumping a hell of alot of fuel in the engine. If your car is really around 58 degrees[typical cold start up temp] it will probably start but its gonna take awhile. If your engine is at 104 degrees [typical warm start up temp] good luck unless you hold the pedal to the floor [ clear flood command, shuts off injectors].

If I were you I would pull the codes from the ECM and see if you have a code 13 [coolant temp sensor open or short]. could just be corrosion build up on the connector at the sensor.