Auto tranny not finding 1st gear?

[turbo347stang]

So I have been running a custom tune for about a month now and have loved it. However, today I went for a quick drive to get some lunch and my tranny was acting a little wierd so I did some stops and starts. It seems like the tranny (which is auto) is starting in a higher gear, 2 or 3, when I start from a low speed or stop and as I try to accelerate it really lugs until the truck realizes it's not in the correct gear then it down shifts and takes off like a rocket because I've had to depress the gas so far to get it to respond. Does this sound like a tranny problem to ya'll or a tuning issue?

I have intentionally not included the tune I am running so I can allow the tuner to fix it before I say anything negative, if you guys do think it's a tuning issue. It is from one of the prefered tuners given from this site so you can rule out a cheap off brand tuner if that was going to be mentioned.

Thanks for any input that you can provide.

Truck info in sig.

[kTm520]

im sure there are trans sensors or seloniods that can cause the problem..doesnt seem like it can be the tune if you have been runnig it for a while. uless your destroying the trans

[turbo347stang]

I would have a hard time believing the tune would destroy the tranny with as popular as this tuner is, but I have heard of tunes become corrupt and causing some strange issues. Or if there is anyone with direct knowledge of similar issues that are tranny related. Thanks for the reply

[chuckles]

Mine has done that in the past and usually when it acts up, a quick retune will fix her up. Sometimes retuning back to stock, running a bit, then reloading hi-po tune will also work.

So IMO, i would return to stock and see what happens. If problems persists, then most likely not tune. If problem goes away. Then I would reload new tune and see what happens.