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Hello. I'm new to the forum. I have an 82 CJ7 with a fresh rebuild 258 and the Hesco MPI installed by myself. At low power the engine runs fine. But under load, say going uphill or when giving a sudden throttle input in a higher gear, the engine begins to misfire or cut out as though one or more cylinders are not firing. If I ease up on the throttle it recovers. If not it shudders pretty bad until I do. If I go easy on the throttle the problem does not occur. Only under load. At cruise speed on the freeway it mostly runs good, but occasionally I do feel a slight power loss as though I am dragging a cylinder. The plugs are clean so I don't suspect an ignition issue. It acts like its running out of gas. Thoughts or suggestions much appreciated. Lou
1991 YJ, 2.5 I4 MPI Starts right up, even on a cold morning. Idles smoothly at 1000 rpm. After less than a minute, revs start to drop to where she almost stalls out but she catches herself, revs back up, settles down and repeats. Does this about 3 times after which she settles into an "almost ( slight drop off but quickly returns to 700 to 800 r's)steady idle". Doesn't do this when she's warmed up. Also did not do this in warmer weather, but that just might be a coincidence. Changed temp sensor, same issue. Pulled idle air motor, very little carbon, cleaned plunger tip, didn't help.