One of my plugs broke in half when I was trying to pull my headers out fo replace the gasket.

So I went ot the store and bought 2 brand new Bosch +4. Screwed them in.

When the engine started it felt like it was shaking a little bit.

What is wrong?

1.Do the new plugs need time to break in? (The other 6 plugs are about 8 months old)
2.When engine is idling it does not have a smooth idle and the RPM fluctuates between 100 to 150 rpm. what would cause that?

PS. I am quite sure that these plugs were correctly gupped.

Thanks.

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89Iroc, 305 TPI, WC T5, 3.08 Posi, Flowtech Headers 1 1/2, Hooker Y-Pipe 2 1/2, 3 inch over the axle, Flowmaster 80, No Cat, Aluminium Driveshaft, Ported Plenum, Air Foil, MAF Screens/Fins removed, K&N, Gutted Air Boxes, AFPR @45 psi, Ram Air, Throttle Body By-pass, Bumped Timing @12, Bosch +4, MSD 8mm wires, HP Rotor, Cap and Fuel Filter, Sensi Trac rear Shocks.

Are you sure you didn't crack any of the other plugs while you were working on the engine? They could be slightly damaged and not noticeable. Only thing I can think of.


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Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

You can't gap the platinum +4 ones, so that isn't the problem. Are all of the other plugs the same? It does sound like you got some type of spark problem.

make sure you put the wires on the correct cylinders.


James

I agree with the plug wire routing.

I always mix up 5 and 7.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

R.I.P. #3
"He can see air"

EB,

You an me both. It's really confusing after a few empty Guiness bottles, especially since they are not only physically adjacent but adjacent in the firing order.

Then again, I have trouble getting a ball point pen to retract after a few stouts...

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Later,
Vader
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"Fear is how I fall, Confusing what is real..."
Adobe Acrobat Reader

No comment.



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"Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."

-Thomas Jefferson

Tisk tisk, Vader's drinking on the job. Time to tell the boss.

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89 IROC-Z 350 TPI

-Flowmaster Catback
-Performance Resource Chip
-700R4 (Rebuilt) Too much done to actually list
-K&N Airfilters
-Ported Plenum
-2.77 Gears (not much to brag about but eh, its there)
-MSD 8.5 mm plug wires
-Gutted cat
-!AIR
-Gutted Air Boxes

Make sure that when you put you're wires back on, that none of them are touching your headers. Cause if they are, they will burn thourgh the insulation and start to ground out.

I'm with you there Vader, only its Coronas...

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

R.I.P. #3
"He can see air"