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5.3l vortex, flex fuel, vin z. power windows slow to go up, heated seat comes on periodicaly, starting problems, no acceleration (reduced engine pwr), ticking, clunking and whining around brakes, codes say o2 sensor and not shifting into 2nd?, jerking into gear, half lighting inside, feels like wheels/axle broken, sways when accelerating. Replaced: plugs, wires, coils, tb, fuel filter and pump, canister purge valve solenoid. Cleaned map, maf, tb again, battery terminals then replaced it also. Took off very terribly clogged cats and ran pipe straight back for now. Been using premium/Lucas gas treatment when able. Disabled single mother of 3 disabled children, can't afford anymore. And the seller is suing me. I am in TX, can I countersue for him selling me a lemon? First time purchasing from individual.Any and all suggestions are greatly appreciated. My only son just asked me to take him fishing and I keep my word. Thanks in advance.
What makes this problem better or worse?
It's worse after driving a while and sometimes from start.
How long has your 2003 GMC Yukon XL 1500 had this problem?
4 months
