When i went to start my jeep in the morning it took alot more than usual cranking and when i finally got it started it sputtered about 5 seconds then it idled normally but i noticed a problem after that When i step on the gas either on drive or in park i rev up the motor and when i get off i hear a popping noise coming from the exhaust it's kinda loud under the jeep not really a problem but kind of annoying after awhile. If anyone could help me with this problem it would be helpful