Tachometer Problems

Have a 93 SC. Tach just quits working while I'm driving. Check engine light comes on, but the car still runs fine. Tach starts to work... light goes off and car still runs fine. Also.. if tach isn't working... car doesn't want to start. It floods out and takes many tries to get it started.

DIS module, coil pack, plug and wires replaced in January.

Any thoughts.... Thanks.

got it!! Camshaft sensor. Tbird is running great!!! Time to sell now!