No spark

I dont have any spare parts to trouble shoot with. Is the ECU the computer? Where is the MAF sensor?
I know the last owner of my truck replaced the computer and the mass airflow sensor. I did pull out the computer (passenger side floorboard) and I opened it up to check it out. It all looked good!
I just think its crazy that my truck went from running fine to busted. Any ways thanks for the help. If I can't get this think knocked out this weekend I'm just going to take it in to a shop.

ECU is the computer in the passenger kick panel, which you stated you took out already. The ECU can be cracked or damaged by leaking capacitors - look very closely. The ECU problem is VERY common in these trucks especially now at their age.

The MAF (Mass Air Flow Sensor) is in the large black hose going form the air box to the intake. Make sure that large black hose is not cracked. Your engine will run like crap if it is!