Originally Posted by ped

I'm hearing some knocking under acceleration in my 2000 Maxima SE. What causes this (I'm using good premium gas)? I haven't had the official 45K tuneup but oil and air filter have been done recently. And hearing part of what goes into the 45K tuneup I'm not convinced they do much to the engine then anyway. How can I fix this without spending lots of monet and what's causing it?