Was having an annoying hiccup on light acceleration uphill that progressed to hard acceleration multi-hiccup one rainy day uphill. I naturally suspected all ignition sensors and components. While inspecting the MAP sensor I discovered a vacuum line dangling. Pulled out the MAP and connected the hose to the little plastic thing underneath Maybe connected to the MAP hose. Vents finally switch!!! Test ride to do daily duties. Still hiccups. OBD code 66 suggested ECM or A/C pressure switch. Plugged in A/C low cutoff and cleared code. Checked for fouling plug. Ain't been there before on this rig. Cleaned2,4,&6 before dark. Discovered 1,3,5 wires wedged under P/S pump in a bad way. Ripped wire loom and worked wires out of crevice. Felt 'em for cuts and found one on the #1 wire. Double taped with a tag piece. In the morning I was preparing to crawl under or pull intake to get clearance to firewall side and the sun showed me the way. I pulled the serpentine and the ground wire and took the alternator loose. EZ access!!! Cleaned the plugs. Rerouted wires. No Hiccups! Smoother idle.