Hello everyone.
Here's my problem, missing at idle in neutral (been trying to solve this for a while). As soon as I apply a little throttle the missing stops until I come to a stop. Then the missing starts again.
So today I decided to check the fuel pressure. With engine off the reading is 40 psi, with the engine running pressure is 50psi.
I believe the fsm calls for 52psi. My question is would this have any effect on the idle?

BTW, this missing gets worse when there is a load on the engine, and the transmission doesn't down shift 4th to 3rd as it should when coming to a stop. Nor dose it down shift smoothly at part throttle.
Also have been getting the p0300 code, new plugs, new coils no vaccum leaks that I can find.
Had this car since new, has 238000 plus miles and is my DD.
THANK YOU everyone.