Quick question

[ILO]

'95 DX. Would the cold idle be higher when the tailpipe is loose going into the muffler?
I just had it replaced. Can I expect the cold idle to be lower now?
Cold idle started at 2500rpm and took about 60 seconds to step down to 1200 which is the highest rpm I can shift out of park at and not have the transmission bang.

Thanks.

 

[ILO]

I'm not looking for anything other than a yes or no.