JcsBlk98z28

I have 98 z28 and the car now runs fine if i dont go wot but once i wo it like boggs and falls flat on its face. have an ls6 intake lid p&p tb and maf.
does anyone know what it might be? and i just replaced the o2 sensors and replaced vacuum lines.

jsteele90

iTrader: (13)

vacumn lines? what vacumn lines? did it run good b4 you replaced all that stuff?

JcsBlk98z28

no it didnt thats why i bought the lines and some other stuff to try and cancel some things out and fix the car

BlackDuk98

iTrader: (34)

When is the last time the fuel filter was changed? May be starving for fuel at WOT, but not while easy driving because it's full of ****. Seen it before. Something to check out.

JcsBlk98z28

i changed it not to long ago but im thinking about changing it again.

Do yall think it could be the computer.

JcsBlk98z28

anyone know?

Young Maro

iTrader: (5)

It's got a ported maf? Might be the problem....

Camaropar

iTrader: (1)

More details about how/when it started

JcsBlk98z28

it happened before the mods i did. but after i changed the spark plugs and wires. like before i changed the plugs and wires it ran bad them i changed them then it did run good for a little bit but then it started running bad again.

jimbo98z

iTrader: (3)

First things first, I'd check for codes.

I'd suspect dirty fuel filter if it's up high. Going lean=knock retard

JcsBlk98z28

will coils throw a code?

SOMbitch

iTrader: (8)

Usually yes a misfire code..

Bramlok

iTrader: (7)

Not exactly related but I saw a Jeep Liberty last week with a bad o2 sensor that caused the entire left bank to misfire. Swapped it over to the other side and it made the right bank misfire. This Jeep only did it on cold starts and was fine after it warmed up.

Not saying that's your problem but it wouldn't hurt to look into the o2 sensors especially if the problem started right after you replaced them. Might be a defective part.

You could have possibly cracked a plug while installing it (i've done that before), or you might have a wire thats not seated properly. With the engine idling, take a spray bottle of water and spray towards the plugs and plug wires to see if it worsens the running condition. If not, I would look into those o2 sensors.

JcsBlk98z28

im going to try the water bottle thing i think i might have crack one because one fell twice but i didnt think of it at the time.