My 1995 gmc suburbans service engine soon light comes on only after i drive on the freeway when i turn the car off than turn it back on the light goes out. i have just changed oil and filter problem began after oil change

Hi reset it by disconnecting the live battery connection for3 mins then re connect that has done it for me if this helps please rate it thanks

Have a 1995 gmc suburban new fuel pump new relay the truck fired up after fix. put 30 gals of fuel in tank . never ran so good started up next day put about 20 miles stopped for 15 min and no start pump does not run at this time . put fuel in intake will run as long as you do this.towed home let sit for 1 hr and turned key on pump runs truck fired right up .ran 100 miles did same thing is running now but dont want to go to far from home please help