i just got my car out of the shop about a month ago. i had a new head gasket put in, some wiring, new distributor and alternator and a new ecu installed. this morning i went out to start my car and it started but then died. it started rpm's went up to maybe 2 and dropped to 0 in the matter of a second or two. i tried to start it again and gave it a little gas and it started up just fine. the idle has been kinda rough lately also, does anybody have an idea what the problem may be? i think the spark plugs are bad and plan on changing them tommorrow and maybe some new wires. what size plugs do i need? do they need to be gapped? do yall think it could be something else that caused it to die like that?