i have a 1986 oldsmobile 98 and how long will it take to change spark...

[kevin b]

...plugs and wires and the coil? my car wont start so they think its the wires and the coil but one person think it might be that the timing is off... i dont see how that can be if i drove to the store and my car started find but when i was going to leave the store the car wouldnt start...the battery is good, it hae gas, any ideals what it might be