Engine sometimes dies when coming off the throttle

5.0L, TrickFlow Top End Kit, 75 mm TB/MAF

I had my car dyno tuned to make sure I wasn't lean ( I was a little). They corrected that with the chip, but ever since when I come off the gas at speed like to turn into my subdivision, the car sometimes dies completely.

I did the IAC test (got the car warm, unplugged it, see if it makes any difference). The idle did change when I did that, and got a little erratic.

I have set the TPS voltage previously (~.98) , haven't checked that again yet.

One other detail, while I was at the tuner we found that one of the injectors had quit...header for that cylinder was cold. I had 24# injectors in it. The tuner didn't have any 24#, so we we replaced them all with 30# and he corrected the MAF in the tune. It dyno'd fine after that and it ran ok coming home.

Any ideas?

Thanks!

Thanks, guys.....I did replace all the injectors with 30# (i fixed my original post to be clearer). And I do have the VSS hooked up. This just started after the tune.....never had an issue with it before.

I'll try the base idle reset, thanks for the tip.

Any other thoughts?

Appreciate it!