I have an 84 5.0 that seems to be running a little lean. I changed the plugs yesterday and there all white. The car is all stock except a single 2.5 in exhaust into a turbo muffler. The EGR has been unplugged and hose plugged. It also has a problem with running at high idle speeds when you come to a stop which eventually idles down. Then the other night I took it to a speed of about 80 and when I backed off it backfired and blew the muffler. I'm not sure if this is all connected there seems to be a few problems I'm facing...thanks
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