1996 Grand Caravan LE 3.8 was running rough. Started with small intermitent bumps or skip a couple of times for a 30 mile journey. Then began running real rough. Check engine light is on and at times flashes. Drinking lots of fuel. Husband changed spark plugs and wires, put it back together and now it won't crank. He says it doesn't have a good spark on all the cylinders. Any ideas? Need a vehicle bad.