OK, so here's the report. Climbed from 800' elevation to 7,000' elevation in less than 40 miles. Temp never got above 188. Just sat in 3rd gear at 2100 RPM's going about 35mph. I am still going to have it steamed cleaned per Wally's recommendation, but couldn't line up anyone prior to leaving last Thursday. Apparently I got a lot of gunk out that was causing the problem just using Simple Green.