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I have a 1992 e350 motor home with a 460 I drive it all the time but I let it set for about 2months but I kept it started the problem is it starts up cold fine stop the pedal and has the power but drive it for 25 miles kick it down it loses power and starts backfire, popping and sounds like I shot a 12 gage out the tail pipe if I turn it off for half hour or so it starts back up fine for 10 minutes then starts the missing again I knocked out the catalytic converter welded the ear pipe up I tuck all the pollution off can someone help
 
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