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-When brake and dim all light that and decrease air flow mean the brake light has bad ground. So it need new or good ground.
-Lot of thing can cause rough idle.
-Vacuum line leak, pinch or block.
-Low fuel pressure
-Bad spark plug or and plug wire, weak spark.
-Coolant leak into the combustion chamber.
That is normal. As you accelerate and rpm's increase the oil pump rpm increases. I think the oil pump runs 1 to 1 or 2 to 1 with the crankshaft rpm. Check the oil and inspect for any visual leaks if the gauge does not operate like that consistently. If it is intermittent or it just started acting that way, the sender my be bad. Other than that any Chevy Dealer will say that is normal.
You put pulleys on to increase power , but slowed down the alternator. Theres your sign. At idle speed the alternator isnt spinning fast enough to charge. So you can put original pulley back on, or a smaller alternator pulley.
Ok not to keen on newer vehicles actually prefer the carburated ones, but oil pressure is supposed increase on your gauge when accelerating. If it wasn't going up before and just staying at 40 the needle might have been stuck. But idle should be 40 lbs and when you work the moter (reving or driving down the road) the guage should show an increase for every 1000 rpm above idle. Second if you can get a hand held scanner (bought mine off ebay for $30) check for any codes in your computer you will probably find that you either have a bank running wrong or some other sensor that needs to be changed. I'd go with getting my own scanner it saves alot of money and time, garages make their money here.