Please delete and redirect me to a thread if this question has already been answered! Hello everyone, I'm new to the Volkswagen world and semi new to diesels...Just bought a 98 Jetta TDI with around 200k on it..having an issue with power. If driven like grandpa on a Sunday afternoon there's no issues. The moment I drive slightly harder such as accelerating onto a highway, whether in 3rd, 4th, or 5th gear and using more throttle, I can feel the power just drop off. I then have to hold it to the floor to maintain speed on small inclines. Restart and problem gone till I accelerate again. No smoke either. No dash lights. Completely stock, no mods. Oil changed and fuel filter. Even ran seafoam through oil before changing and fuel for about a week. No sure if related, but there is a tiny coolant leak coming from thermostat housing and the pipe going from heater core to oil cooler (No longer available for purchase). The speedo and temp gauges don't work either. Working on those soon also.