99s-10 blazer 4.3w cyl 2and 3 misfire plague

[74lt]

Hello,
working on a 99 chevy s-10 blazer 4x4 engine code w with 80k replaced distributor cap and rotor, replaced spark plugs, plug wires.
still have misfire on cyl. two and three. poppet injectors blasted out at gm dealer, . ran fine for three days, started misfiring again.
fuel pressure 3-5 pounds low, swapped mass air flow sensors , no change.
replaced injectors 2 and 3 , no change.tried different plug wires no change.
miss is most noticable in park at light throttle.
codes are po300 random misfire.??????

[dmbrisket 51]

is there a cam/crank code?

[RahX]

I've seen those crazy caps arc internally. Might try changing out the cap again. Take it back and get another.

[Cam1959]

I presume the poppet injectors you say gm dealer cleaned out and got good running for few days, are the fuel injectors ?

Even though you changed them, something seems interfering with light draw at low rpm. Could there be deposits in injector feed or gas lines ? Or is it carboning them up in cylinder by running to rich ? choke ?

[dewaynep]

I just posted in the other misfire post. Do youself a favor and get an AC/Delco distributor cap and rotor if you don't already have one. Don't use the aftermarket caps and rotors they have a tendency to cause p0300 general misfire codes. The misfires usually occur at cruising speed on a level highway. You state the code as p0300 but think the misfire is in cylinders 2 and 3? There would be codes p0302 and p0303 stored if that were the case. Try an AC/Delco cap and rotor directly from the dealer.