Check the IQ valve under the seat. It is usually the problem when street racing a stock car.
07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car.
1) Rebuild to stock 2) Install Cobb/piggyback? and JRZ suspension. 3) Build parrallel HPFP and highflow intake manifold with multi-port fuel and meth. 4) Build full cage and staged twin setup with twinscroll turbochargers. (BW 7670-1.22 / S374-1.25)