After pulling the driveshaft to replace u-joints, I have no fire.  Fuel pump engages, gets fuel (plugs are wet), starter cranks, but we are getting no fire.  Just got back in from replacing the sparkplugs as they were toast and it still won't fire.  Any suggestions?

Vehicle info: 2000 Chevy Tracker 2.0L 4WD

Check your igniton wiring - each coil pack has a 3 wire plug - outer ones are power (ground & switched +12v), center is the drive signal from the ECU.

Thank you for the suggestion, that is something we actually had checked before I posted.  We discovered that some how the engine was flooded?  Not sure how that happened, but it is running fine now.

That happens very occasionally to me (say once a year).  It's flooded cylinders.  Probably an obscure malfunction in the ECM's firmware.

If it happens again, crank the engine with the gas pedal on the floor - that cuts off the fuel, and the airflow through the cylinders will dry the plugs.  Normally the engine will fire within about 10 seconds.