I'd start by checking for vacuum leaks.
You can tell if the transmission, in your 1998 Chevy Malibu, is going bad. If there is a whining or clunking noise. The transmission might cause your engine to install when you are stopped with your foot on the brake.
it might not have enough brake fluid or your ABS is going bad. i would take it to a shop cause that can be serious.
There are several things that can cause your 2004 Chevy Trailblazer headlights to keep going out. The most common cause is a loose or corroded ground wire.
Check the brake fluid level in reservoir.
Spark plugs, wires or timing off
The alternator may be going bad.
In my experience with my Chevy it was a ground wire
back brake springs weak or broken! or a brake part is broken.
Either warped rotors or drums can cause pulsating. Apply the parking brake slowly while going about 15mph and see if t pulsates. If it does, it is the drums that need turning. If not, it is the rotors that need turning.
I'd check the fuel filter first.
The wire you are looking for is a white wire in the bundle that is closest to the brake pedal. Use a test light or meter to check voltage going through the wire when the pedal is pressed.
Like if you going to change brakes on the van...you will see like a small box that looks like a relay and its pointing to like a gear around the shaft that's your sensor...signal will be sent off speed car is going to determine your brake force