I bought this 96 f250 to flip, it was hard starting on cold mornings, and when it would start would blow heaps of white smoke. I changed the icp and it was good for a couple of mornings that wasn't very cold but has been difficult the last couple mornings. I tested the gpr tonight and it wasn't powering the glow plug side at all. So I changed it out and now it stays on for maybe a minute after the engine is running? Is this normal? I presume they go off after the engine starts or after the wait to start light goes out?