1990 Dodge Caravan will not start

hi, how long since a tune-up? Check for trouble codes. You should be able to get some mil codes by cycling the ignition switch. You turn key just till dash lites come on, no further, cycle the key, on--off, on--off, on, then the mil starts flashing, you count the flashes to get the codes. Your looking for two digit codes.

Did you check for primary voltage at the coil, engine cranking, dark green wire with black tracer should be hot.