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I'm going through similar frustrations.
A while back I had to replace a valve spring. That was about 30k ago. Had similar symptoms.
I recently started experiencing the same sputtering as you describe. 1st I went with a higher grade octane for a couple fill ups. Made a real difference for me....for a while at least. The combo of winter gas & ethanol mixes is I think starting to take it's toll, although I don't have any real testing of any sort to back this theory up. Anyway that seemed to help the situation.
Condition came back again, but stronger. This time we checked the plugs & wires etc. Since I was at about 30k with them I changed them all out. In the process found I had blown a plug in #1. So now we're checking mixture. Cleaned the MAF and I must admit I didn't get as much of a bang out of cleaning it as some here have...oh well.
just some thoughts. Good luck!
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65 356SC Cab - 70 T Sunroof Coupe - 82 SC Targa - 86 Coupe - 87 Targa - all sold years ago
89 944S2 Daily Driver-Sold because...still thinking why.
73.5CIS Targa Shed Find -On the Road Again
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