[whodatschrome]

Jeep sat for 15 years?...bad gas can and will cause bent pushrods. The old fuel will gum up the valve stems, causing the valves to stick inside their guides. Spend the $20 on 5 new pushrods and drain all of the old fuel out of the tank before you fill it back up with brand new fresh gas. Flush the rest of the old fuel from the lines, then start the engine back up.