I've recently got my new starlet, its a 96 glanza v on 59000 miles. Completly standard apart from hks exhaust although not for long! Last night i tried swapping the two pipes over to bypass the solenoid which restricts boost in 1st and 2nd gears. The difference at first was impressive with a stronger pull from the word go, however after about 2-3 minutes at around 4000rpm an engine warning light came on and then went off followed by jerkiness under acceleration from the engine. The light went off but then came back on again later, so we did what any proffesional mechanic would do and removed the bulb and tried again, yet more hesitation, we drove it gently 2-4000rpm with less than half throttle but no change still hesitant, swapped them back and it was fine. I was confused as everything on the car is in good condition and its running on vpower so whats going on? Could it be detonation, or timing or something up with dizzy cap, rotor arm or spark plugs. Just wondering if anyone has experienced this as i would really like to run the car without this restrictor in place, any help would really be appreciated.