skip/hesitation taking off warm
89 Cougar 3.8 no SC.
once warmed up, it hesitates/skips when accelerating from a stop. If I give it part throttle (which in all its 145 hp glory isn't all that often, usually WOT) it can continue for awhile, skipping while accelerating. Once underway, load or no load, I don't get the same feeling, only from a standing start. It is starting to shake a little when started cold or warm, but it is way smoother than most other cars I ride in, it is only noticable because I have driven the thing for the last 100k miles.
Recently the bypass hose got a hole in it, spraying some electrical connectors with antfreeze and causing the CEL to illuminate. Once I found the hose (it was leaking from the hole in the hose from the hoseclamp being pop riveted to it) and replaced it, I also put back on the front end accessories (took off the powersteering pump because I thought it was the waterpump).
After getting the top end of the engine clean from antifreeze/radiator sealer, and replacing the cap and rotor, I changed the fuel filter.
I have owned the car for the last 11 years, and it has never ran like this (except when the head gaskets went). I think it sounds like the fuel pump is on its way out. I don't remember how many miles ago I replaced it because it was noisy, probably 70 or 80k ago. I bought a new fuel filter because I don't think this was happening prior to changing it, but I don't remember. I have gotten three tanks of gas from different stations. I don't know if we have recently changed formulations (different gas for winter and summer, it is in the mid 80s now) and I don't remember this car reacting to the weather and or gas changes before.
Sounds like fuel, right? I found a ton of gunk in the distributor when I replaced cap/rotor, and the plugs have 60 or 70k on them. I want to keep it running because it is my driver when I am working on my 97 Cougar, or my 2000 Grand Marquis. I plan on replacing the sparkplugs too, but this doesn't seem like the problem, I want to fix this before investing any more time keeping it on the road.
Head gaskets 40k or so ago
That is all I can think of other than normal maintenance. Bosch platinum plugs. I haven't done a seafoam treatment on it for 7 or 8 months. When I did that, I got about 2.5 mpg increase, that has started to slip away, but I am using the AC more now.