Have you tried getting a can of MAF cleaner and hosing it down? The stuff is only about $3.00, so it's a cheap first step. Also, while you're in there, take a look at the condition of your ETA (assuming you have one, of course). After 20 years it might need a bit of attention as well.

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles