Egr?
 

I am having a weird pinging issue with my 99 SS i will be cruising at about 30 to 40 mph and just give slight gas and it starts to ping.could it be a bad egr?Or should i start by giving the car car a full tune up!Thanks

30-40 in what gear with what trans? What fuel are you running? How many miles on the car?

Its a auto trans the car has 90k and i always use 93 octane.and the car is not throwing any codes.

Clean the MAF, Seafoam, and recheck

Ok then the above is the way to start.

Ok i bought the seafoam and Crc Maf cleaner.The back of the can of the Crc says to take the maf out of the car to clean but can't i just disconnect it and spray it while still in the car?

You could, but why? Removal is just as easy, and it will prevent the pooling of the chemicals in the bellows. And with the intact tract removed, you can inspect the throttle body bore for carbon deposits and clean if necessary. Peek inside the intake manifold (through the throttle body) to inspect for excessive oil, and if present, could be the reason why the Seafoam treatment is necessary...