Starnzy25

I have a 305 TBI. She idles fine 95% of the time. Every now and again (especially when up to temp) she acts like she's about to stall but never does. Most times will idle quietly at 600 rpm on the button. Upon acceleration or even constant pressure will herk and jerk pretty badly. Some days are better than others and she seems to do it less when cold outside and the engine hasn't been running too long. I have replaced 7/8 spark plugs, cylinder 2 is blocked by new exhaust manifold. NEW: wires, cap and rotor, coil,battery, tps was replaced last year, new egr and iac, fuel pump last year, fuel filter last week, K&N air filter cleaned.

I'm thinking the tps is garbage bc it isn't delco, or maybe the timing chain has slack. She only has 154k miles, but chain has never been replaced I"m sure.

All input is GREATLY welcomed and appreciated!!