reybalt

Hey guys, my 09 SS has been having problems. The car has a misfire and the rpm needle drops and goes back up when it's on neutral coming to a stop. Could it be a dirty throttle body? Or dirty maf? Btw. It's running lean and it has a brand new ldk installed. Any help will be great. Thanks

footballplaya3k

iTrader: (1)

Have you boost-leak tested?

reybalt

I haven't. I will do that tomorrow. I recently installed an aftermarket lower charge pipe and then all these problems started to occur.

footballplaya3k

iTrader: (1)

That could be it. What charge pipe?

reybalt

Hahn

footballplaya3k

iTrader: (1)

Scary. Watch out for rust.

Sl0wbaltSS

Running lean on a new ldk? get retuned. Def don't stay on oem LNF or gms1

reybalt

It's currently on gms1. Why don't you recommend the gms1?

ECaulk

iTrader: (6)

Dont listen to him.

The rpm dropping is most likely connected to a vacuum or boost leak probably from the lower charge pipe. Start there, when you installed the LDK did you use new AC Delco plugs? And then the break in period was followed?

reybalt

I bought the ldk long block from zzp. It already came with spark plugs but i have (new) spare spark plugs. However i did leave my aftermarket c.a.i. installed. Not sure if that can cause it.

ECaulk

iTrader: (6)

Which intake?

reybalt

Aem cold air intake.

ECaulk

iTrader: (6)

Do you still have the stock one kicking around? If so put that on till you can get the issue straighten out then try the AEM intake again

umrdyldo

iTrader: (1)

For sure sounds like a boost leak probably in lower charge pipe.

Do you have any way to monitor the car? You should be watching your fuel trims and such.

Especially after a new install. You have no idea how it's running and could hurt the new engine.

Sl0wbaltSS

I had a huge hole in my OEM intercooler and it idled perfect and AFR's were perfect. Just no power