Were travelling in Oregon and Washington, 2004 Fleetwood 36B Pace Arrow, runs well for first 100 miles or so, then starts missing pulling grades, can't get over 40 MPH, this goes on for 30 miles , then we stop at a rest area for a short time and when we leave it runs fine for another 50-100 miles and then starts missing again. I know about the engine heat issues with this engine/doghouse, and replaced the plug wires yesterday, my local shop replaced the O2 sensor about a month ago trying to fix the same issue. Any ideas ?
Thanks
John
Thanks
John