Spin Balance the tires. Check the alignment. Check the CV joints. Pulsing sounds electrical. Put it on a scope. By the way......nice ride!!
There is a sensor in the accelerator paddle should be your first place to check.
checkig all your pulses
Check the motor mounts. Check the catylitic convertors.
Check fuel pressure to be sure it's in spec. If it is, then you must check the injectors for pulses.
Check for vacuum leak at brake booster
Need to check the U-joints in the driveshaft.
Most than more likely one of your motor mounts is messed up. You should check those out. Can also be a vacuum leak.
check your coil pack - mine had the same issue before.
check the airflow meter
that truck is pretty old .... you should check ALL your fuel filters
i would check the brake rotors for warping if it gets worse when pressing the brakes
Well, there are a bunch of problems. If the car vibrates that means that you should check the oil. Than, if the check indicator is on, I've heard from the mecanics that the board computer has a problem. So, you have to go to the service immediately. If heard and read a lot of problems with this Check indicator. Good luck!