so i have a 2001 blazer im usually pretty good at finding a problem but this time im at a loss. so my car tends to idle high on the initial start up about 1000 rpms never gets lower but when i put car in reverse it goes downa little when its in drive its kinda rough but when i slow down or turn it shuts down as well as just driving it cuts off idk what it could be fuel pump is good alternator is good timing belt and spark plugs as well i thought ignition switch but i dont think its that either if any more info needed please respond or message me asap trying to get back on the road by monday