my car runs great until it's good and warm then it starts missing out real bad. first just at high rpms but as i continue running it it gradually works it's way down the rpms until it just won't run. let it cool off and it runs fine again. just did a tune up new wires cap plugs etc. no vaccum leaks 45psi fuel pressure. please help!!!???

 

Sounds like a coil going bad. When it gets to where it won't run, check and see how good your spark is.

 

get a hair dryer or heat gun and when its cold use it on the coil to warm it up a little. Than try starting it nad see how it runs. If it runs fine than try the stator in the distributor, take the cap off and heat the inside of it. than try starting it.