I'm experiencing a loss of power when climbing grades. Usually happens after I been on the road for a while or the weather is warm.
I've taken it in the 3 different shops over the last 3 weeks. The first one changed the fuel filter. It drove fine for a week. the second one did a fuel pressure test and could find no problem, but they said the ignition coil was burned a replaced it. The 3rd place said that because of the age of the van that unless it happened while they were testing they couldn't diagnose anything.