car was sitting for about 2 months or more i have octane booster but havent put it in yet wondering wat it could be
thanks

 

please be a little more descriptive. is this a constant knock or does it increase with engine speed??? can you hear it at idle or not??

 

wow...sounds like an engine knock of some kind...

 

ok, it could an engine ping from to much advance on the timing, it could be a spun rod bearing, it could be a valve tick, there are many possible things that could make noise. you need to tell us every detail like, when ideling what do you hear, when starting what do you hear, when drivinig what do you hear, and when you stomp on it what do you hear. go take it for a ride and tell us everything that happened when you drove it. just to be safe before you drive it, check the oil psi. if it is a bearing it could be your oil pump crapped out and the bearings were starved of oil.

 

I would suspect possibly water in the gas if it was sitting for that long.
This can happen pretty fast if it sat without a full tank,condensation happens in the tank and the water settles to the bottom then when you start driving some mixes with the gas and as we all know water does not burn well.
You might try adding a bottle of "heat" gas drier with a full tank of gas then go and drive around a while to see if it doesn't clear up.

 

It could be a bad gasket or exhaust leak by the manifold also, especially if you only hear it when accelerating

 

My car actually did the same thing for awhile. I replaced the coil distributor cap and wire/plugs and it worked like a charm. cost u some money tho. ouch!