I have a 1999 lumina with 190,000k on it. The problem is that it will start and idle fine but when i go to excell. it will buck and want to stall. Release gas it goes back to idle fine. This only happens on when it is damp or cold. If i run it for a while it will run fine. I changes egr,02 had fuel press checked. I tried unplugging o2 and it run ok for a day then started acting up again. I opened to gas cap and the pressure was great so i tried leaving it loose and so far so good. Any ideas??? I'm stumped!!! Please help.
Thanks,
