Can you post pics of your paint job? I am just starting to restore my FJ62's undercarriage. I'm going all out and will be using Eastwood's Rust Encapsulator, Chassis Paint, etc.
My 1989 FJ62 had a sticker price of $23,065 (included CA Emissions, A/C, Stereo, Power Package, Floor Mats and Destination Charge). I have the original sticker and I'm the 2nd owner.
Check the TPS
I suggest for you to check out the TPS. The TPS contact may be worn out and need replacement. Worn out contacts will cause the engine to hesitate when idle as well as causing the timing to go way off.
Cheers!