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My mechanic has it now and that is what he suspects as well, would that make it turn over more often before it starts, could it be the glow plug regulator?
When cold, after startup, drive it pretty hard to build boost. The boost builds heat, and if it starts running normal, then it is likely the glow plugs.
Is this a turbo motor? By my memory the 91 was an NA IDI engine. Had an 89 F350 with the same setup. The glow plugs get going bad and usually take out the glow plug relay. That relay is the same part type as the mag switch for the starter. Replace it when you do the glow plugs, and also get the new wiring harness with the valve cover gaskets. Running as many amps as glow plugs do coupled with putting the wiring harness under the vanve cover makes it worth your time for a relatively cheap part to replace all of it if you are going to open it up and dive in.
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