Well, on my N/A I had a similar problem. Ignition timing was off (Distributor 180 out). I know that the 7MGTE uses a Cam Position Sensor and Coil Packs instead of a distributor, but maybe your CPS is out of alignment, causing it to occasionally fire on the exhaust stroke.
Hope this gives you something to look at and hopefully fix
__________________
1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
|