2002 Dodge Durango not wanting to go

My durango is not wanting to go, or having a hard time going, when I take my foot off the gas petal it quickly drops down in speed to 0 and just doesn't want to move. This has happened twice and I smell something like rubber or plastic at the front driver wheel. I have checked the em brakes and making sure it is in 2 wheel drive. What else can we look at?

Thanks
debcoon@insightbb.com