hi! first time posting on a forum, really hoping yall can help me figure out what's going on! i have a 95 escort wagon (1.9 engine) and its running like shit. theres a sporadic hesitation that seems like a misfire, both when idling and driving, the problem seems cyclical although irregular, and now it's at the point that it's more or less undriveable. it more or less cycles through periods of running "OK" for a minute or two, and then hesitating/misfiring a bunch, then returning to running okay again, though this cycle can vary and can appear quite random. when it's not running okay it doesnt die, but almost feels like it is going to then will rev really high a second after the hesitation/misfire. when it is misfiring the check engine light flashes and relays under the hood click loudly. when i checked the spark plugs (which i replaced) they were black/ "carbon fouled". tried but wasnt able to pull codes. nothing came up for "key on engine off" except for "unable to retrieve", and when i tried pulling the "continuous memory" codes the hesitation/misfire makes the check engine light flash erratically making it impossible to read the codes. ive been doing some reading and think the symptoms might indicate something in the emissions system. thinking maybe o2 (HEGO) sensor, or another sensor but i'm not sure and was wondering if people have other ideas or things to try. not a real car guy but i'm trying to learn and figure this one out myself, so your patience is appreciated haha thanks !