While driving down the road the rpms will jump 200-500 most the time with the ac on sometimes w/o! Done some research and found stuff about battery cables being bad so replaced the positive cables and hooked up 2 grounds I found that had broken! Thought I had fixed my problem but 2day it did it again the only code its showing is P1492 battery temp sensor so changed it but code still there so I'm stumped!!!

 

Someone said something about TPS?? Where is it and how do I test it?