This just cropped up with the SDL of mine. I don't get the light at key- on and it will start with much hesitance. The difference though is the glow light comes on just after the rough idle and smoke (~20-30 secs.) go away and remains on for seemingly 3 times the normal timeout expected at any given ambient temp. I have not been able to test the plugs or even open the hood as I go to work in the dark and return 13 hours later. It will just have to wait for the weekend. Also, I thought a bad gp would cause the light to flash or is it a bad relay/ blown strip that will do that? Mine just does the dizzying and taunting light on after the rough starting

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1984 TDT Blue on Blue "Harriet"
314,143 9/29/05- Our first date
351,000 12/29/08- Oh, the places we have gone!

1991 SDL Black on Palomino "Winchester the III"
188,655 8/11/07
218,700 12/29/08

Work vehicles:
MCI-
D4500 125k
D4505 200k
102A-3 1.8Million! and my fav