Engine backfires through intake on 2000 Dodge Ram Van 3500

Every several weeks my van backfires ( sounds like through the intake) Only does this when starting out warm.

by in Wickenburg, AZ on September 19, 2012
1 answer 2 comments
ANSWER by , September 22, 2012
Mileage, engine,trans. and maint info all helpful to answer your inquiry.Any recent(3Mo.) repairs?
COMMENT by , September 23, 2012
149000 miles.I think it's a 318,Automatic trans.No recent repairs, Has had regular maintenance.It did it about 6 weeks and 4000 miles ago than again recently. It lasts for about 30 seconds than runs fine again. Thanks millions for any help.
COMMENT by , September 26, 2012
Has the check engine light ever come on , or has it been scanned to see if any temporary (pending) codes are stored? maybe have 'live' data scanned to watch for misfires under the conditions described when it occurs.