I have a 99 tacoma that i need help with. First off after it got warmed up it wouldnt want to crank back up sometimes not everytime till it cooled off. I talked with a buddy and he told me to change the coil pack and the pluges and wires. So I did but it wouldnt do anything but idle right if ya gave it gas it would start skipping and back fireing. so I changed everything back to the original stuff and it is still doing the same thing. I cant find any vacume lines loose either. I even unplugged the battery. but the check engine light isnt coming on either. Can someone please help me?