Something is draining the battery, then when I get the battery charged the car will start then rough idle and stop if I hit the gas. I'm usually not able to restart it at that point. While its running I pull the p1233 code.

I've already replaced the FPDM and the CCRM but I'm still getting the p1233 code. I just ordered a new inertia switch if mine is faulty, but in the case that it's not the problem what else could it be? a faulty or shorting FPDM harness maybe? how do I go about determining that and replacing it if so? any help is appreciated, thanks in advance.

 

If all those modules are new and good, then your issue is a faulty wiring issue, or the PCM itself is messed up. You'll need a wiring diagram and location chart to trace the wires to see if they're corroded or shorted or such, and inspect all connections thereto. A shop manual is recommended.

I googled P1233 and got a lot of youtubes on this as well as pages and pages. Pretty much they're all the same. Usually the FPDM is corroded and faulty, but if it's not, you're going wire diving.