My 98 civic is making me nuts I had a new motor put in and it will show multiple disfire codes and I changed about everything I had a distributor with my old motor and thought it was fine I have changed everything but fuel pump but runs sluggish and shakes on a load but after a few miles it will start to run rough and the cel will flash a bunch of times and then stay on I have over 3 grand in this thing and can't drive it and I used to be a body and paint and a welder but cancer took that from me and I am a kind of good mech but this one has got me I put me o2 manifold cap plugs wires rotor button and fule filter and the filter on the fulepmmp also please someone help me

The motor I put in only had 70k on it so I put new oil pump water pump timing belt and all that car sound good when you start it and revs good but it's a 5 speed and you can tell when you drive it that something is wrong please help

Install a new Ignition Control Module (ICM) and coil, which can be aftermarket to keep the cost down, in a genuine Honda distributor housing, along with a new rotor and distributor cap. Stay away from aftermarket distributor housings for Hondas, since they never get the internal sensors right and become totally unreliable. Be sure to apply silicone heat transfer compound to the back of the new ICM; otherwise, it won't last long. Only use properly gapped NGK spark plugs in your Civic. Coat the porcelain portion of the plug and the top electrode with dielectric grease. Fully seat the spark plug wires in the distributor cap and on the plugs. Clear old codes and set the timing, by ear or with a timing light, by rotating the distributor housing. Afterwards, tighten the three distributor mounting bolts. This should solve your misfire problem. Ensure all parts are the ones specified for your engine.

Is your new engine exactly the same engine as the original? If not, there may be an ECM compatibility problem.

Ya it's a d16y8 block I used my the original intake on it

If you know the distributor housing is made by Honda for your engine, you may be able to solve the problem by just replacing the ICM. They are notorious for causing misfire problems. I recommend replacing them every 125,000 miles or 10 years, whichever comes first. Still, it's best to replace the coil and rotor at the same time.

If you know the distributor housing is made by Honda for your engine, you may be able to solve the problem by just replacing the ICM. They are notorious for causing misfire problems. I recommend replacing them every 125,000 miles or 10 years, whichever comes first. Still, it's best to replace the coil and rotor at the same time.

I got a brand new distributor and put it on and it done the same thing I'm lost it showed a p1399 p0300 304 302 301 misfire on all 4 plugs I'm so lost if u have any ideas would love to here them

Did the new distributor come with a new coil and ICM? Check for air leaks. Start the engine, allow it to warm up, and spray a Windex bottle of water around the intake manifold. Listen for any change in the engine. If you hear a change in the engine, replace the intake manifold gasket. Also, I would remove all the spark plugs and check each cylinder's compression--it may reveal a problem with the valves.