Hi. I am new heremy first post. I just bought an 89 Chevy C-2500 Scottsdale (130k). On the way home the "Service Engine Soon" light came on and stayed on. When I shut down the truck and then re-start it, it's ok for a few minutes then the message comes back on. Is this something I can do myself or does this need a "real professional".

Thanks for your time,

Doug