i'm a little confused..the car cranks over fine but has trouble firing up??
or does the car have problems with cranking over??
Just keep in mind these 86's do not have a starter relay ( unsure with the trueno's??) possibly you have bad contact for starter solenoid , cheapest thing to do first is wire in a starter relay which is easy and cheap! if this relates to the car having problems cranking over..
cheers twisty