I replaced the glow plugs in the 96 E300 this weekend, it seems to have corrected the CEL but now on cold first start of the day the engine does not run smoothly right at first as before. Did I miss something or did I get a bad set of GP's? After the first start it does fine. I removed the old ones and installed the new ones (Bosch Duratherm) The parts man stated that there were two different GP's listed but supposedly gave me the correct ones. Could they be wrong? I plan to ohm the gp's from the controller this afternoon to see if any are bad. Is this common to get bad gp's?

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Keith Schuster
2006 E350 98K miles
2013 Ford Explorer 15K miles