Ok, My 93 s10 4.3 TBI starts and idles mostly OK ( maybe a little rough ) and shoots a puff of blueish smoke that smells kinda like gas. Once it warms up and Im driving when I come to a stop it often just dies right there. NO chugging or anything it just dies as if I turned it off.. its instant. It usually wont restart unless I wait awhile. Well I replaced the o2 sensor, TPS.. and cleaned the EGR and IAC. After cleaning the EGR and IAC and starting it I let the computer idle it for 10 or so minutes then went in there and gave it gas while in park. I noticed two new things, the oil pressure gauge seems to not be as smooth as it used to be when going down.. it will go smooth then jump 1/8 inch then go smooth again.. and while in park if I give it a decent amount of gas the speedometer needle moves up!!! IN PARK. What is going on? NO trouble codes.

Thanks