Yes, ignition timing has to do with the distributor. It is definitely worth checking, as a lot of people do not set it properly in the first place. It's important that when checking and setting the ignition timing the engine is at operating temperature and the diagnostic box is jumped in the same way you do for checking codes. You then set your base timing to 10? BTDC.
Check here, borrowed this from BillUK in another thread
*Note: You will connect your timing light to the No. 1 plug wire on your N/A*
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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
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