You have a vacuum leak. there is usually i vacuum (i know i cannot spell that word, and i really cannot think of another way) diagram in your hood. follow all the hoses around looking for one that is not hooked up. if they all are, rub them down in mr bubble, start your car, and watch for little bubbles to form. usually vacuumn hoses is a feet cents a foot.
The power brake vacuum booster is failing.
brake booster vacuum leak,or bad brake booster.
A leak in the brake booster is one common reason why a car would stall or hesitate when the brakes are pushed. There could also be an obstruction in the brake line.
The power brake booster is bad.
It could stall if you use the rear brake while going downhill. Is this the case?
Why would it stall or almost stall in Reverse but not in Drive? How long since it's received a tune-up and thorough check-up? How is the compression?
You need a tune-up
set the parking brake on put the trans into drive and while applying the brake set the rpm to its higher point the release
it is a strongpossibility you plugs could be your only prob but also you should check you air fuel ratios and injectors plugs and vaccums are the easiest mto cgheck
because everyone elses 1993 ford tempos stall when they idle. learn to drive with one foot on the gas and one on the brake like I do in my '93 tempo. keep the RPM at 1000 and it won't stall out.
bad booster pump or air in brake lines
because it's low on gas.