I bought a 98 camaro with the 3.8 v6 and just put a motor in it.It was running bad and I was getting a maf sensor code.Bought a new one and it is still throwing the code.The car is shakey at idle and sounds like it is missing while driving.Any Ides what it could be?

 

Check the connections to the MAF

 

What do you mean?Inside the connector, if so what should I look for?

 

At the connector. Sometimes the connection can get loose, or even debris can get there. You might want to try some 'electronic cleaner' spray... or rubbing alchohol on the tip of a q-tip.

 

It can either be the MAF, which after you changed it, you should have gotten the code reset. However, that being said, you need to check the vacuum line as well. I've done this, taken the vacuum tube off, forgotten to put it back on, and had the car run like garbage because the vacuum line wasn't on. Becuase the vacuum line isn't on, the car isn't able to pull as much air through the filter as it should, thus causing a problem with enough air not going through the Mass Air Flow. The one time I did it was when I polished my throttle body, and forgot to put it back on. I had MAF code, vacuum codes, throttle position issues, the works. When I did get the vacuum line back on, I noticed the boot was shot to hell anyways, and replaced it.

 

The maf code is now fixed.Their is a fuse in the engine compartment labeled eng sensor and it was blown.Now I am getting a p0300 multiple cylinder misfire code.It sound like it is missing and the service engine light will flash sometimes meaning it could be messing up my cat.

 

Try running a few tanks of a good fuel system cleaner, and see if that helps.