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The brake and ABS lights could be on because of a brake or ABS problem. The ABS system uses the hydraulic brake system in addition to the ABS components. The high idle could be a vac leak or a problem with the idle air control valve. You could check the computer for trouble codes even if the warning light does not stay on.
You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.
In this case having the check-engine light is a good thing. Take the car to AutoZone and have them scan the computer for codes - they do it for free, whereas a shop will charge up to an hour's labor. Have them give you a printout of the codes, and post them here as a comment/reply. I can help you define them and see what needs to be done.
Any time that the check engine light comes on, it indicates that the computer has found a condition serious enough to require service action. Rent a scanner, read the code(s), and pursue to repair(s). The scanner will clear the trouble light when the repairs are complete.
It sounds like there could be a problem with the idle air control valve, but if the check engine light is on, take the car to an autoparts store and have them scan the computer for any fault codes that are stored. Most parts stores will scan the computer for free. Getting the fault codes will help identify the source of the problem. Hope this helped and best wishes.
its a vacumm guys check all your hoses with a carb cleaner while engine on be carefull not to let it catch on fire with the spray ok give it a slight of puff of it with the spray ok!! remember truck hoses are old and cracking ..
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