Horrible bucking problem

[Chevelle5434]

I've been having a hesitation issue, i replaced the knock sensor yesterday. I know it didn't have anything to do with my hesitation but I saw the wires were no longer connected to the sensor. everything is back together and now the second I start moving and give it gas the car bucks so hard your head goes for the windshield and I can hear the motor bounce forward. When this happens my lights on the dash flash like the car died. Once I let off the gas it goes back to normal.

I have taken the top end back apart to see if I've missed anything and found nothing wrong. My friend has a known good ecu I installed that no change. I do have a bad battery I have to jump it for the time being... I don't know if that would cause any issue though.?

Things I have done since I bought the car, I added braided fuel lines with SX performance filter and FPR. I added PTE 550 injectors. I put in spark plugs I think they are bkr7e (I'll check for sure tomorrow).

I bought the car with 15g turbos, safc ii, blitz EBC, wideband.

Seems like everything I do makes it worse, now I can't even get it down the road.

[Hard AttacK]

Is your tps set right?

[Chevelle5434]

I haven't yet, im hoping to get it hooked up to a hhh soon.

[stealthee]

Almost sounds like it could be a MAS issue.

[white92vr4]

Do you have a datalogger? If not, I would get Evoscan and the cable on order ASAP. I have a hunch that the logs will reveal all.....
Fuel pressure should be checked as well, if possible. You don't want starve those 15Gs for fuel with dropping FP on boost.

FYI, I was having similar problems bucking and hesitation. On the first datalog I found that one of my O2 sensors is reading 1.6-1.9 Volts( - should be 0 volts to .9 normally from what I read.)

[GTOJOE]

Almost sounds like it could be a MAS issue.

This.

Unplug your MAS/MAF and see if anything changes. It will throw up a CEL but ignore it. If it makes no difference it's not the MAF. Unplug the battery for a few mins to clear the CEL. The other possibility is the fuel pump resistor. Mine was causing a stumble but nothing as series as what you're saying. When my MAF went though it was exactly as yours sounds.

[J-Groove]

Did you forgot to clamp down any intake lines?

Did you swap to an open atmosphere set up?

Sounds like a crazy lean buck. (large increase in un-metered air, could also be the result of a bad MAF as stated before)

-John