Question on why do I sometimes get a backfire from my 2.2 GOWESTY WBX. yesterday I drove the 88 gl Westy an 1.5 hr pulled over to check my GPS, shut the engine off. Then 2 minutes later started it and "bang" it backfired, it did start. Shut it down and tried again same thing. Drove home it didn't occur again. Any thoughts of what is going on? The new  Engine has about 5000 miles on it. Maybe to many mice running around in there.

Dennis Jowell
Scotch Hollow Farm
Newbury, Vermont