Weird problem that happened out of the blue on my bros 1999 Park Ave. It'* so strange that it'* hard to convey in words.
1) It was drive normally, until he exited the freeway and stopped at the light.
2) Once stopped it would not go forward anymore.
3) It works fine in reverse.
4) All forward gears it acts like the e-brake is on, but it'* not.
5) It doesn't act like it is in neutral and just rev. the engine. When your hit the accelerator it tries to go, i mean with some real power it will go about 6 inches with very loud popping like something is jumping teeth? Flywheel?

So I am at a total loss, as it seems like the tranny has good power still. It don't slip. The fluid is a tiny bit low, I mean tiny bit 1/2 pint'ish, and it looked and smelled fine.

Does anyone have any insight on this? I may be wrong but it sounds like the popping is coming from the front passenger wheel or that side of the motor.

Shot in the dark here. Do you know if the front mount is intact or been replaced? If engine moves too far, it could start binding on itself. Just a thought.

The car looks like it was definitely wrecked and repaired "cheaply" in the front. I did look at the front mount, but not very closely, it looks to be original, very old at least. FYI this car has 250k on it. I'm not really sure what to look for on the mount other than torn rubber which I didn't see, and it looked to be in the OG location.

Quick way to tell if any engine mounts are shot is to have someone inside the car with their foot on the brake and the E-brake engaged and to put the transmission in gear and carefully apply acceleration. What you are looking for at this point is if the engine rocks forward or backward depending on the gear.

250K? Just a shot in the dark here....your tranny'* gone....

I think the tranny could be ok. It has fluid, it doesn't appear burnt or anything. Also it goes in reverse fine, and when in the forward gears it seams to have plenty of power and goes into gear just fine. But it'* like trying to drive with the brakes on, after you give it enough gas it will go a few inches, make a loud pop/grind sound then stop. When it stops the whole car jerks forward and backwards it'* not like it creeps then dies, I'm not a mechanic nor have I rebuilt a tranny before. I have only seen 2 dead trannys, 1 torque converter with the snout ripped off, 2 the typical burned out friction plates. I just can't think of something that would pop and grind going forward but not backwards.

Hmmm, looking at items 1 and 2
1) comming off freeway, lots o' brake being used there, Grinding noise at all.
2) caliper bolt come loose and the caliper is hitting the rim while trying to go forward?
My caliper did that to me, it did a grinding noise before I got to far on it. Found quickly and corrected problem. Gouged out a good 1/8 inch of aluminum on the rim before I corrected.

CDAJoe You nailed it! Top bolt came out of the caliper. The bottom one was only finger tight, so obviously whoever replaced the brakes forgot to tighten them up. I always hate it when folks post for help and then never reply as to what the resolution was. Thanks for your help guys.