Just put new spark plugs, spark plug wires, distributor and rotor in my '95 5.8 liter on Sunday. Everything went good....maybe too good. Fired right up and ran good. This morning, after sitting idle monday and tuesday, it started slow. 8 mile trip to day care, turned it off and dropped the 4 year off.....total of 10 minutes or so. Then started slow but ran to Advance Auto for an air filter purchase (about 3 miles). Then would not crank. Tested Battery and it was fine. Anyway, a set of jumper cables and a jump start it fired right up. Drove it for 30 minutes to make sure it had a decent charge. Let it sit for about 45 minutes and it started slow yet again. Can anybody help me with this problem? Starter? Batttery? Whats happening here?