help trying to fix ourselves

i have a 1994 lumina apv 3.1 . i have two problems going on . my check engine light is coming on but only after i have driven it for over 6 miles at a time or so. when i turn it off and let it cool down it goes off until i drive it for at least 6 miles agian.

second one is my abs brake light and check brake light is coming on . it only comes on when i start the van and not every time. when it comes on you can hear something ingaging or disingaging.? i am not sure but my brakes get tighter when this happens.
my husband is going to change the brake pads this weekend . but i dont think the pads would be causing the light to come on and do that .
thank you for any help

You need to get the codes scanned on your van and see what you have popping up and go from there.

..my check engine light is coming on ..after i have driven it for over 6 miles at a time or so. ..
..my abs brake light and check brake light is coming on ... when it comes on you can hear something ingaging or disingaging.?

'94 codes need a GM scanner ....any other symptoms beside the CEL ? ANy problem with engine temperature ?

ABS makes a noise and thump when it sets in. ABS light can be trigged on by a number of factors, including sensor failure at any of the 4 wheels...
THe RED brake light can come on for a low brake fluid level, from parking brake pedal not fully in the up position, parking brake pedal switch misadjusted , from rear brakes that are severely out of adjustment, or from sick master cylinder..