My idle seems to go up to 1500-1600 rpms at times, I can kick it back down into regular 1000-1100 rpm mode by snapping the throttle like an old carb engine. What should I look for, NOT CARPET- CHECKED. Could it be the TPS? The other thing is, the car runs fantastic, purrs and really is great to drive, but at times I will be stopped at a light, foot off clutch and it will just die, instantly, like the ignition just cut out, if I turn key off and restart all is back to normal, always re-starts no problem. Any thoughts?