I have 93 blazer 350tbi 226k on it but it has a rough idle when I first start it and wants to stall sometimes it does mainly when I got to put it in gear if I rev it a few times or just idle for a little bit it'll start to idle fine till I shut it off and start it again I replaced the knock sensor, fuel relay,vss, fuel filter,fuel pump,distributor cap and rotor, plugs and wires. I have ran out of ideas.. The guy who had it before me said it start only doing it when the abs light came on which makes no sense to me at all. Any ideas to point me in the right direction would be greatfully appreciated.