Fist let me thank you for your ideas. I'll check with the parts and repair places in my town about scanning.
I just came in from my garage and noticed some things that might help.
1) When my car is at idle, it run as if nothing is wrong. But, if I increase the rpm to about 3,000 rpm, the motor shakes. Like a rocking motion.
2) I checked my spark plugs, all of them are firing. If I remove a plug wire the idle gets real rough. When I put it back on it idles normal.
3) Took off my air cleaner box (with the butterfly valve assembly). No change. The same indication as I mentioned before.
Again, thanks.