Anyone ever had this happen. I start my car, it bucks when in 1st gear. RPM's don't go nutty or anything, just bucks, then after the motor heats up, no bucking? I just had the car retuned at Brenspeed and they adjusted my throttle to make it less sensitive. But, it's fine after I drive it 5 or 10 minutes, so I don't think its the tune.

Any thoughts?

Thanks

 

It's the tune, mine does same thing, running too rich on cold air idle circuit

 

mine has always done this, stock, with cai, and even more so with the vortech on.. always goes away after its warmed up

 

Mine also does this too, even more so after I got my cams, but I just let it idle for like 30 seconds and then she is good to go

 

Mine does the same thing. Brenspeed told me to let the car idle until the idle comes back down to normal, then drive off. They were right. It was smooth after that.

 

My 93 octane Brenspeed tune does the same thing, but in less than 2 minutes it goes like a stripe-***ed ape.

 

93 Torque tune does it too, sometimes even after the RPMs drop. I live on a big hill so I just let it roll and take off in 2nd if I'm in a rush.

 

You are in open loop mode and the brenspeed tune has little effect
during that mode until the PCM enters closed loop when it starts
using the brenspeed tune parameters....
Let the cats warm up and its closed loop mode for you real soon.

 

mines does it too with the brenspeed tune.actually mines only does it cold and when i reach a 1000 rpms only, but when it warms up it goes away.i spoke to them about it and they told me to clean the throttle body.my bama race tune used to do it even worth.

 

yeah not to keep saying the same thing but mine did it until I cleaned the throttle body out. I was surprised at how much build up there was in there. Now when I start it just give it a few seconds in the summer, a little longer in the winter and no problems.