AM radio static, cannot hear playing FM works fine

Your AM reception is probably fine when the engine is not running. AM radio is subject to ignition noise, while FM is not. The problem could be that the ignition wires are "leaking" electricity, enough to be picked up by the radio. Try spraying the ignition wires with silicone lubricant spray, if the helps, replace the wires with new "radio suppression" wires for a bigger improvement.