My 94 ls400 has started like missing going down the road. the check engine light comes on and it is difficult to accelerate. sometimes it is fine for a long time and then this happens suddenly.

 

The usual suspects after you get the error codes read. Tune-up, etc.

Then for reading this thread:
https://www.clublexus.com/forums/ls4...capacitor.html

 

Thanks for the help. I will take the ecm apart and check the capacitors. was hoping for easier fix but what r ya gonna do

 

Just read the codes before you dive into that project.
http://www.lexls.com/tutorials/intro/codereading.html

 

Could this problem be the fuel pump or filter

 

It could be lots of things. Even as simple as water in the gas, bad gas etc.
Heres the code read instructions.
http://www.lexls.com/tutorials/intro/codereading.html Oops looks like someone else sent ya there. sorry didn't read them all.

It could be an ignition system problem, that is any where from the coils and distributor caps to the spark plugs.
But before digging there do a compression test.
Even a temp sensor, O2 sensor etc. that's why you start at the DTC's Diagnostic Trouble Codes.

Fuel pump and filter, would show up as a loss of power, like going up hills, it wouldn't miss it would act like running out of fuel.

 

Thanks to sha4000 and dicer. I have the hardest time navigated around this site. Thanksvfor the help

 

What codes did you pull? And did you fix it yet?