98 honda has grinding noise only in park and neutral stops when put in gear

common cause of grinding in park is worn or damaged parking prawl. transmission issue.

I think uve gt enuf answers but i wud check release bearing

If noise comes from transmission in D range -no drive.Then i thing of AT internal problem. If in D during driving then you have to check drivetrain,like axles or bearings. or AT.

I had the same problem on my 1999 Honda Accord 4 cyl. It was the ignition switch. I received a letter from Honda regarding a recall on the ignition switch and had it replaced. 3 years after replacement it would turn off again & this time I purchased part from eBaby & replaced it myself. It hasn’t stalled since.

just how low???? i think its a new box now,,, you realy done this one in if you have lost all drive even after topping up the box with ATF its a goner sorry

That is normal, in park or neutral there is no resistance on the engine when you put it in gear there is resistance because the car wants to move. Also when you turn on the ac that turns on the compressor that is run off the belts of the engine so it puts more resistance on the engine. Low idle is not a problem unless the engine dies.

You need a new throwout bearing in your clutch assembly.

I would recommend you take it to 3 different repair shops to get quotes on the cost of repairs.
Sounds internal to me .
Automatic transmissions are best left to the Pro's to fix , You need alot of tools and a very very very clean workshop for starters.
Hope this helps , Sorry I couldn't offer a quick fix.

near the throttle body there is an adjusting screw(flat head) for air fuel mixture, it's on a deep cavity sometimes with a cover, adjust counterclockwise will increase the idle.

ck the coolant level if this is ok then its the idle air control valve