I have a 98 grizzly that has recently came to my possession from a family member. It died on us while hauling wood one day and found out the primary coul was bad. I swapped it out and ran like a champ at idle, however if I give it even the slightest bit of gas it starts to bog down and backfire violently. It did sit up for 4 months under a tarp before I got around to putting the coil in. I love this rig but it is giving me quite a headache lately and I need help.