My 1993 jeep start up but keep puping out what is it help

. Check for codes.

. Check all under dash and under hood fuses with a test light or multimeter.

. Check/replace the Crankshaft Position Sensor.

. Replace fuel filter.

. Replace spark plugs with the same Champion plugs that originally came in the truck, if they have not been changed in 3 years.

. Check ignition switch for wear, pitting, or melting, if the problem persists.