About a week ago I started my 3.0 sidi omega parked on grass on an extremely cold morning.
Parking a car on grass in cold weather can cause condensation within the engine bay as the engine and air temp cool down… so water could pool around leads and could and such, causing idle issues which go away with a little heat…
And old leads, plugs and coils can also cause issues as already mentioned…
Is it worth trying a fuel cleaner in case there's water that may be causing this?
If it’s been parked on the grass for a while, air could make its way into the tank bringing in moisture with it.
Moisture inside the tank will condense and that little bit of water could cause misfires as water and fuel don’t mix.
Add that to potentially stale fuel and you could get more misfires. Never discount a bad batch of fuel…
You could try putting a cup of metho in the tank as that allows any small amounts of water to mix with the fuel and then be better consumed by the engine… You could also run a couple of tanks of good fuel with some injector cleaner if you haven’t done such, it can’t really hurt… especially if the car has been sitting for a while…
Just note that some injector cleaners warn that after a couple bottles have been run through the engine, the engine oil and filter should be replaced
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