So I have an auto VT. Yesterday I was driving it and it was fine. Stopped at a friend's, turned it off, started it again about 10mins later and started driving... all of a sudden it is shuddering and feeling like it's about to stall even though doing 60. Went round the block and back to my friends, feeling like it was going to shut down every time I slowed down. Get out the car and can smell sulfer unburt fuel type of smell really bad. Honestly, I have no idea about cars. Have checked all levels and oil okay, trans fluid stick level is sitting at something above hot that says "Deep Pan Only". All the plugs are in around the engine. Though something on the far left seemed a bit loose, the sticker was gone but looked like MGA 700 or something? I tried to push it back in and seemed to sort of connect again, could that be it? I started it and revved it a little for a while but when I release the throttle it still idles low and car shuddering. Is this a trans ploblem, plugs, coils, egr? Any ideas? I have no idea what I am doing.