ok just bought a 99 cherokee 4.0 amd was fine for the first week then started having trouble starting. i would go to crank it over and seems like it would want to start but then just dies, had it tested and battery was fine, alt was a little weak so i replaced it and problem is still happening, i turn it over and need to apply the gas pedal for a little then it will fun fine on its own, only happens on a cold start usually, any suggestions? replaced the terminals also