My 02 Dakota 3.9 will just occasionally shaking and loosing massive power. It kinda feels like its flooded or missing. I'm pretty sure it only does this when either the defroster or air conditioner is on. The check engine light has been on for 30,000 miles. I gave up on it after I took it to a mechanic and the code was vaccum leak. I replaced a cracked hose but the light came right back on. Pls help. thanks,

Get a can of carburetor cleaner spray around the intake manifold edges and other hoses or areas where a leak can occur. If you hit a leak it will smooth out immediately.

can you smell gas when this dose this? and he's right to do the carb cleaning you'll know when you find the leak or leaks it will smooth out when you find out if any leaks.