I have a 2004 140" passenger van with 90,000 miles. In the last 2 months on long (10 mile ) uphill grades under constant load I'll loose maybe 5%-10% of my power about every 15- 25 seconds, for maybe 3-5 seconds, and then get it back. While this is happening I have constant pressure on accelerator. My fuel millage is 22-23 mph. Thanks for any feedback.
Pete
Pete