MBP 2.16 core duo networking slow

Hi
My 2.16 MBP Core duo seems to be having networking speed issues. When I first got it in September 2006, I was seeing bandwidth speeds on my home wireless network comparable to a wired computer on the same router (Apple Extreme base station, comcast cable modem), 2 to 2.5 Mbs. However now I'm only getting 600-700 Kbs on the MBP, yet the older (1 Ghz G4) iMac is still getting the higher rate. Thinking it was a wireless problem, I turned off the Airport card and connected the MBP directly to the cable modem. Unfortunately, I still get a bandwidth connection about one third that of the old iMac.
Any troubleshooting ideas? Thanks!
MacBook Pro 2.16 core duo   Mac OS X (10.4.8)  

This problem has been on several threads. I thought the new release for the Airport update would fix it. To date I have:
Retrograded back to 10.4.7. This fixed the speed problem.
Today I reloaded 10.4.8, upgraded with the past 2 months of security fixes and the new Airport update. The speed problem has returned - about 1/10 the speed as before - really crawls.
I still believe it is an issue with the original dual core (not the 2's) and 10.4.8. I will now go through the process of reloading the original OSX from the install disk, then run the 10.4.7 combo update. Thankfully I downloaded that 143 MB chunk before I went back to 10.4.8. Good luck, but I think there is a very deep problem with .8 that hasn't been addressed for us early intel adopters.

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