My Nissan 300zx did that before i did a tune up last summer. Now it fires on the turn of the key.Youd be amazed what a good tune up can do! Plugs, wires, fuel system treatment...

 

WORD!! double plats are the bomb!
also, run to napa and ask them where the good injector cleaner is... they'll hook you up with this stuff in a can... the bottle looks kind of haokie/cheesy... but trust me it's awesome ****... I sware to god that it is almost magic...

 

Mopar combustion chamber cleaner is the bomb!

 

Valvoline feul system treatment baby (I used to work in a shop) it's a 3 part system Throttle body cleaner feul additive and a valve cleaning drip.