If your Mountain Aire is on a Workhorse chassis with the 8.1 Chevrolet engine, they are notorious for burning plug wires due to bad airflow across the exhaust manifolds. The repair is to buy a GOOD quality set of high heat plug wires.
If it checks out electrically, check the fuel filter and fuel pump.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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