had a 95 4runner come in last week, barely running. The customer had /tried/ to do a "tune-up" and royally botched it.
Some of the plugs were not seated, and he broke some of the new (very fat, incorrect) plug wires. We figured the correct installation of correct parts, plus a cap and rotor would have him on his way.
Unfortunately (for me) the car drove like a tug boat! Idled fine, revved in the bay, but wouldn't pull out into traffic.
hmmmm.
Low fuel pressure or volume? Nope. Plugged exhaust? Nope.
What I found with a little research about these ancient beasts, is that if the TPS is slightly out-of-adjustment, then the idle switch (internal to TPS) is not closed, and when you set the timing per factory specs/procedures, (with diag jumpered E1-TE1) it will be wrong.
Re-set TPS. Re-set timing. Vrooooom.
thanks for letting me share.
GW