bobpie,
I have a Coachmen Sentara with a 2001 V-10, I could have written your post myself..... except Check Engine Light did not come on. You have saved me a painstakeing troubleshooting routine. Only in heavy rain, I would get the mometayr "hick-up".. started subtile, then would get worse..... thought I had bought bad gas first time experinced.
Thank you for your input - you saved me a ton of time!!!!!!
Glad to be of help. My coach has run great since. Altough I have yet to drive in a very heavy down pour like that time.