2002 dodge ram 3.7 v6 auto,bone stock, started to have trouble with ck engine lite coming on at low speed 20 to 30 m.p.h,had it ck,ed and showed battery dieing,replaced batt,1 week later,came on again had it ck,ed showed alt was bad ,replaced alt,2 days later lite comes on again,took it to dealer,and they told me it was the egr bad, ive looked all over the engine an it dont seem to have a egr,have ck,d the pvc,all the vac lines for cracks ect,one other thing when the lite comes on my gas mileage go kaput,this is driving me nuts an costing big bucks