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Have a 2004 Fleetwood excursion 39l, has a Cummins isc350. Just bought it used. First big trip ran great on way out, then about 300 miles into return trip starting chugging as we came into Sioux Falls. Check engine line flashed but went off. Made it to an exit. Seemed to run OK at city street speeds. Came to a gas station. Filled up and headed back out. Ran fine till got to about 50 miles. Then started chugging again. Pulled over called good Sam. Gave me the names of about ten repair places. Begged for Cummins number. Finally got that. They sent me to another Cummins shop because they couldn't get me in. Now here 3 days. Fault code didn't reveal magic answer and haven't been able to get it to throw a new code. Ran that first night with computer hooked up while driving. Mechanic said could see it calling for appropriate pressure but delivery dropping. Changed both fuel filters both before we left and as early try at repair. After much diagnosis time with no answers had them change low pressure fuel pump. Better but problem still recurs although it seems to be less dramatic. Mechanic said line from tank to pump not obstructed. He drove it last night for about 40 miles. Went long stretches without problem recurring but it did happen sporadically . Read through some posts and saw conversations on PAC brake. Found it and it appears to be fully retracted. Wasn't using it at the time. Supposed to have their Cummins and RV expert here tomorrow so hoping he can figure it out. Been pretty impressed with quality of answers on here so I thought I'd see if you had any words of wisdom. Thanks in advance. Ken