1995 Toyota Tacoma skipping

Tuned up about 5000 miles ago, started skipping a little, has never skipped unless it wants a tune-up. Tuned it up again with new denso plugs, wires, rotor, dist. Cap, ran for a week or so started skipping again not to bad, but enough to be annoying, filled up about 1/2 to 3/4 added some lucas gas treatment, ran ok for 3 or 4 days with maybe a skip here and there, then started skipping again, thought it could be fuel filter, so we replaced it, the old one was clogged somewhat, had to blow on it hard and blew debri out, it ran about 2 or 3 days with only minor skip, finally it just stopped, we replaced dist. Coil( was bad) replaced cam sensor, now it sits and runs with no skip when idling, but if you try to drive it, it skips and jerks. Don't have no idea what this is. What do you think it is? Could a bad battery cause this? The battery checks out on machine to be bad, but it still starts the truck. Thought maybe it's not getting steady current, but that would come from alternator I think. Don't have no ideal on this one. It's got me puzzled. I need help. I'm on disability and this is my only means of transportation and this rental car fee is killing me. Thanks. Ron