My engine feels like its misfiring, but i have ran a diagnostics even and nothing is coming up. I sometimes stalls after i start it cold from sitting for a few days. I can feel it almost like it is misfiring when i put it into drive and sit there. Timing is good. I brought up the idea of maybe the TPS but i was told the problem would be more frequent. HELP ME WHAT IS WRONG?!?!?!?!?!?!?![:@]