BigJames

Just joined tonight and wanted to say hello to everyone its great to find such a great site!!!I'm James from Calgary AB I have a 1991 Protege LX sedan with a 1.8L 16V DOHC ,automatic ,193000Kms I just bought it off a older lady 1 owner and it runs great, timing chain was recently done along with the cv joints. but i took out the air filter and it was realllllly bad!! It has one problem when im in Reverse or stopped in Drive at light or a drive through it shakes/Vibrates terribly so i slip it into Neutral and its fine what do you think it could be???? I'M also wondering where to start with performance mods I just gave it a full tune up and all fluids change?
Well hope to hear from you all and Thanks for everyones help.