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[Tony H]

Afternoon all, my Miggy has developed a missfire. it doesn't happen when the engine is stone cold but appears as soon as the engine starts to warm up, the missfire happens on gradual acceleration but disappears on hard acceleration and all six pots start to fire. Anyone got any clues.
TIA
Regards
Tony

[henryd]

V6 but 2.5/3.0 or 2.6/3.2?

[Tony H]

2.5  It used to state that on my avatar until I was hacked and someone nobbled it!!!

[TheBoy]

Paperclip it anyway, but I suspect nothing.

Also check the plug wells for oil, and the state of the HT leads. If you can, visually inspect the DIS pack - bit of a PITA to get out.

[dbug]

check for oil in plug wells, then plugs, leads, dis pack and compressions

[al brown]

Had this on mine a while a while ago. Was a broken no 6 plug lead, even tho I had checked it when checking the plugs and plug wells.I thought it was fine until I went to put it back on and it separated in my hand.
Hope you get it sorted.

[Tony H]

Still got problems the car is of the road at the moment due to no MOT so I couldn't road test the engine under load. The problem now is that I have replaced the lead it runs smoothly at high revs but on initial start up it revved its nuts off then settled down to a very lumpy idle after about 30 seconds and has now developed a back fire at idle 

[adey2]

id deffo be checking the dis pack, same prob as mine after missis cooked it on m6, had cracked through on underside so when got warm it broke down on no6 and no1 cyl

[omegod]

sounds familiar to my old 3.0 which turned out to be the coil pack, I think I have a few odd leads knocking around if you want to try substitution or if need be give me a shout for a hand changing the coil pack   

[Andy H]

I spent a lot of time trying to fix a misfire on my previous 2.6 V6.

A set of new GM spark plugs fixed it