Toyota Repair: Hi, I have a 92 Toy tercel..., piston ring, independent shop

Question
Hi, I have a 92 Toy tercel with auto trans 100.000 miles already. the oroblem is shaking and it got worse so it stall when stop in traffic unless I turn off A/c and/or put in neutral. I replaced plugs, D. cap with wire, air filter,gas filter, ck timing, ck vaccum leaks already but still.... please give advice thank you.  

Answer
This is a case where you need to check the most basic thing that will give you an indication of the engines condition, take it to either the toyota dealer or an independent shop and have the engine compression checked, there is a possibility that one of the cylinder has low compression either due to a leaking valve or piston ring problem, do this first before putting any more parts into it.