I'm not sure if these are separate issues so here it is. I have a doge ram 2500 2003 4wd when driving I have the brake light and the abs light on. I also notice it is slow to accelerate. After changing the air and fuel filter and putting some fuel injector in today I did notice improvements, but still it not accelerating as fast as it should be. Any help would be appreciated. Going to check the speed sensor shortly.

 

Ground the #13 pin of the OBDll Port (under the dash) once you take away that ground the ABD and BRAKE lite will flash. If it's a 2 digit number it will flash x amount of times pause then continue. So if you had ABS code 12 it would flash like this: one pause one one, which would be twelve. One you do this past back with the number and I can help you. They aren't related btw. Your other problem could be fuel pressure, cat clogged, etc. Need to know the engine. Is there check engine light on?