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Eric,
Check your spark plug wire running from the coil to the dizzy.
Had a mystery problem with my Vanagon (Digifant, a lot like Ljet), idled fine, started bucking and snorting worse and worse, and after about 3-4 minutes it would hardly run (120 degrees?).
Seems my dealer, when I took it in for service, did a number on one of my 2 month old Bosch( $65.00 a set extra special unobtainium) spark plug wires. The plug wire measured fine when cold, ran fine when cold, and when it warmed up, became an insulator.....Sound familiar? Since the wires ran fine for 2 months before I took it to the dealer, I had no reason to suspect it.
65.00 for another set fixed the problem.... Since my first set lasted 140,000 miles, I'm now set for life.............
Hope this helps. It's not polite to ask how long it took me to realize that the dealer prepped wire changed with temperature.
Ken
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