quick help! frontend problems

[low 84]

well my steering is screwing up big time. what happens is if i more than moderately push on the brakes or hit a bump going at higher speeds the whole front end starts to shimmy/shake back and forth. this is not just a little vibration its big time shake. i checked the steering out in the parking lot and discovered that the braket that holds the idler arm to the frame was loose causing the center link and the rest of the steering setup to be wobbely. i tightened that bracket up. i also noticed that the baljionts on the idler arm are completeley shot. like no greese and a ton of play in them. i'm going to the parts store to get a new idler arm tommorow and put it on in the parking lot.

what else should i check? could a warped rotor also be adding to the problem or is this more than likley all steering related? what other steering parts should i check and how do i check them, rather than just going out there and shoking the crap out of them by hand to feel any play?

thanks for any help, i have to fix this fast b/c i dirve the trcuk every day and it is very dangerous with the steering screwed up like this. i have to drive 3 hours to dallas next fri too and there is no way i'm taking this thing on the highway with this problem.