Vortech V-2
DeatchWrek 450cc injecter
Walbro 255 fuel pump
Aem FIC

P 0301,0302,0303,0304,0300

if i drive the car normally then it ok nothing wrong.
when i drop gear then i got misfire: say if i drive 60 mile/h and from 4th gear drop to 3rd gear and slowly let go the clutch and slowly hit on the gas then it ok. but say i was drivin and doin 60 and on 4th gear if i drop 3rd and pop the clutch fast and hit the gas fast then i get misfire.

i think when i pop the clutch so fast then hit the gas then there was too much air going in but not enough gas going in so i get misfire. i was thinkin go bigger injecter...


any common or suggestion that be nice
thanks

 

What spark plug you using . One step colder gap .28 would be good should not Misfire with this also check your coil packs

 

NGK Iridium

 

That's good for stock but not fi the one step colder cost like 8 bucks at discount auto parts or autozone or nappa

 

Check your fuel pump. I was misfiring on all 4 cylinders after it gradually got worst. its started off as a simple misfire that was only like once every two days until my car finally would not start

Found out it was the fuel regulator on my fuel pump was going out and therefore the gas was not being sent properly to the engine which caused a misfire.

I have the same fuel pump! just my $0.2

 

at idle it ok
if i drive regularly and shift at 5000rpm. nothing wrong with it
only if i shift about 7-8000rpm then i see the check engine light or sometime itz blink then go off , sometime itz stay on

 

i try to change that thanks

 

i think my spark plug is already 1 step colder... kinda dont remember my friend put spark plug in but i remmber he say is colder spark plug ... anyway it seem i i get misfire for 7-8000 rpms range...

i pay attention every time i drove the car... when i start the car in the morning and i it warm up.. and i drive the car i try to get7-8000rpms and shift it then there no misfire
but then if and try to do again shift at 7-8000rpms after the first time then i get misfire from between 7-8000rpms...

 

should i check the gap on spark and regap at 0.032-0.035 if possible?
i have about 400-500 mile on those spark plug
or should i go with IK24's

 

Plugs are relatively cheap, so I'd buy a new set and know with 100% certainty that you're running 1-step colder plugs and not relying on a friend, even though he may be right.

I run NGK Iridium IX Spark Plug BKR8EIX #2668 with the gap as-is out of the box. You should at least visually check that the gap is the same for all plugs if you don't have a feeler to measure.