my 04 gt 3.4 misfires help

[rerod_22]

just done plugs wires air filter fuel filter cleaned throtle body and coil pack. Car still has misfire at low speeds and choppy at 80kmh.

[350F]

Is it throwing a check engine light?

[rerod_22]

no lights also put injector cleaner

[gt00]

Do a compression check and see if there's an internal issue causing the miss . A clogged injector could also be suspect ..... ;)

[boomboomgrandam]

ok i know this is gonna sound crazy, but i bet its your fuel pressure regulator. i had the same problem with my car for months, it would miss fire at idle or pretty much any light load condition (cruise control ). i changed : air filter, fuel filter, plugs, wires, all kinds of things in to the tank to clean the injectors, nothing worked. well one day coming home i smelled gas and had a look. my FPR was leaking gas. changed it the next day (easy to do ) and the problem has been gone since.

[rerod_22]

will try what is the fuel pressure

[boomboomgrandam]

this is the fuel pressure regulator

[rerod_22]

thanks i bypasses the regulator help a little but not much the fuel pressure was around 53 at idle ?