I have a ABS, Brake Warning and Check Engine light that are all coming on. I am not sure what it is but The ABS and Brake light come on when I start the Truck. They then dim but stay on. I recently got the check engine light on. The ABS and Brake light will go out completely and then come back on. The guy i bought it from told me that it only does it when the weather is hot. I have only had the truck for about 5 days. I was wondering if it could be the rear ABS Vehicle speed sensor. Any trouble shooting would be helpful. Also anyone recommend shocks. I think my origanal Factory shock are probably done.