Ticking in motor, then stops for about a month, then starts ticking again. oil changed. in nuetral it wont rev past 3500 rpm

In park, this could be normal. ECU does this. around 2800 to 3500 RPMs. If driving, have the codes read. No codes , could be a clogged fuel filter, bad fuel pump(have the pressure checked), or clogged catalytic converter/s. With no codes, something is restricted..

Check if the air filter is clogged with oil and dirt. Check the timing, then check that the cam belt has not slipped. Could be plug wires, but this will usually cause rough running as well. Could be low fuel pressure.

This noise you hear is the hydraulic tappets ,there gummed up change the oil and use a cheap diesel/petrol engine oil a 2 second squirt of fairy liquid into the oil filler and leave for a couple of thousand kms then change the oil again and this will clear the gummed up holes allowing the hydraulic tappets to re adjust

Ticking sound could be coming from a Coil-on-Plug, or a pcv valve, or (hope it's not) a valve lifter which could be sticking. Sticking lifter noise often disappears when rpm's change, or the noise comes & goes. try changing the motor oil & filter right after adding an Engine-Flush Treatment to the motor oil, running the engine for 10 minutes at idle with treatment added to the oil, then draining the oil & changing filter while oil is still very hot. That last part is very important, so be careful not to burn your hands - be careful. -- The sticking lifter is a likely cause if motor oil has not been changed at frequent intervals in the past (every 3-4K miles) -- dirty oil causes sticking lifters.

2 problems do not inter react , 2 and 3 gear relates to clutches or syncros or badly allined shift gear , 3500 revs points to gas problem of filter prob

oil level low ,start engine ,handbrake on then select reverse and then check oil level ,think you are about at a least a litre short

low transmission fluid level about a litre and a half should cure it at a rough guess ,start engine ,handbrake on then select reverse and then check oil level it definatly sounds low to me

the ignition control module may be going bad. call your local honda dealer with your vin # they had a recall on the control module for 91-93. they will tell you if yours was replaced already if not you can pick one up for $60 at autoparts store and it is located inside distributor

first try using redexe fuel additive (a full bottle to 5gallons)to clean injectors/fuel pump.
your car has a fuel cutoff valve,saves fuel when coasting(over 1800 revs,if you put car in nuetral going down hill you use fuel,so you are wasting fuel in neutral.but you have read the handbook cos it tells you in there.......

Honestly I wish I could offer you more info, if it revs now that eliminates the convertor, only I can figure is when you got it to rev you were "blowing the soot out" LOL I hope I have helped you some if so please rate me accordingly.