You got 1999 Pontiac Montana and it well not start it trying to start but it dont and its getting gas and sparks good it sounds like its backfire in the intake when you hold down on the pedal.?

Answer 1

first off did you recently do any other work to the Montana? like change plugs or wires? if you did you may have mixed up the firing order or have the wrong wire on the wrong plug, i did this once and after fixing the wiring it started and ran great for another 10 yrs. Try rhis,,,form looking at the engine radiator side cylinder should be 2-4-6,,firewall side 1,3,5 next is the coil pack id ,same view side near you ( coil pack close to firewall) First terminal 5,2 , second term 3,6, last term 4,1, hope this helps

first off did you recently do any other work to the montana? like change plugs or wires? if you did you may have mixed up the firing order or have the wrong wire on the wrong plug, i did this once and after fixing the wiring it started and ran great for another 10 yrs. Try rhis,,,form looking at the engine radiator side cylinder should be 2-4-6,,firewall side 1,3,5 next is the coil pack id ,same view side near you ( coil pack close to firewall) First terminal 5,2 , second term 3,6, last term 4,1, hope this helps

Forgot to add on are you getting any trouble lights, check eng ? this will have to have the code read by a tech to determine the exact problem