Hey guys this has been driving me nuts. I've got 2000 prelude with 11.1, pro1, 525cc on hondata s300 ran in open loop. It ran great for a few months but it started having a random stumble while at cruise some times. Then it was like my tune was changing even though everything was perfect. Some days it would go lean and require a bunch more fuel throughout map. Now it stumblez alot at cruise, goes crazy after hot restarts for probably 5min, and at idle it stumblez constantly with erratic after. I spent alot of time on this tune before all this started so afr was steady so it's definitely not the tune. I've replaced all sensors, hondata, ecu, fuel pump, injectors, fpr, distributor,coil, plugs, wires. I've also checked compression 225 all four and leak down. I tried going to chrome but I just got a solid cel. I've checked pretty much all wiring and grounds. What the hell could this be? Thanks for any reply