im buying a 88 supra (my first self bought/ dream car) from a buddie who got this from some random guy but the thing is the car wont hold fire like it starts on occasion it turns over as much as you want but i have to turn the key on and off to prime it then when i get to start it it turns over fires for a sec and wont run the car has spark and fuel its in time it just wont stay runnin the guy said he fired it up and drove it last month but it just starts when it wants to i need my car to work please someone help me