yeah i'm new to this whole forum stuff but....i just bought a 91 k5 with a stock 350 in great condition....anyways its been running fine until the other day just lost tons of power at full throttle.....it has more power at half throttle than full throttle. anyways i figured it was a fuel problem so i replaced the fuel filter and it was almost completely clogged but it didn't really change anything...and now its even worse. when i start it and put it in gear it dies...i have to keep the rpms up in order to put it in gear. i checked the timing and it was 20 degrees advanced for some reason and when i tried to put it back to 10 degrees advanced it died on me. i checked the spark plugs the cap and rotor. the check engine light isn't coming on either so its not setting any codes.... do you guys have any clue what it could be?