This car has sat awhile, but now it is almost running great minus a few issues.. First let me say i have ran new gas thru it, some reg and most premium in the last few days since i got it running again.. I will try to detail as much as i can on the problems, i am a DIY mechanic and love challenges but this issue is kind of defeating me and i need some outside input..
It has new Plugs & Wires, coil pack,crankshaftsensor,air filter, oil filter, oil change, thermostat, battery,and muffler. The Coil pack was bad, before i replaced it the car made some huge back fires (at least 5) hence the new muffler. The motor sounds strong now, i have driven it a 100 or so mile but here is the deal, when i come to a stop it stalls. Not so much at first but after 10 minutes or half hour it wants to stall when braking and stopping. The motor will restart immediately and most times i can continue on but sometimes when it is restarted it run 10 times as bad, for instance it feels like it is out of time perhaps, spitting and sputtering hard just to get to 25mph. I have no "Check engine light"... I am at the end of my rope and looking for suggestions. Should i take the throttle body off and clean out all the carbon from backfiring and running on a bad coil pack? Should i start disassembling vacuum lines and look for wear or leaks?
Any information that can get me started in the right direction would be very appreciated. Thanks and good day.