I recently got swaped my engine of suzuki cultus efi (G10B,1000cc) with (G13B, 1300cc). The car runs fine on cng while when cold in the morning, it missfires on petrol and some time does not take acceleration while driving on petrol, specially after a gear change. All the wiring in the engine including efi wiring is brand new (repalced with engine swap). Qualified electrician has checked and diagnosed no electrical problem. Inlet manifold and throtle body is not repalced and is of G10B, 1000 cc engine. Please help to come out of the situaution.:(:(:(:(:(:(:(:(:(:(