1993 Travelaire 454 chev p30 low power

Gjac wrote:
I would do several things to narrow down this problem. The first thing I would find a flat stretch of Highway and do a 40-60 mpg test and post the time,if your wt is about 15,000 lbs with no mods 20 secs would be about normal and your MH would be normal, you only have 230 HP stock. The second thing is to check your computer and see if you have any stored codes,it should be an OBD1 and the service light will flash what codes are stored. If you search this forum it will give you the details on how to do this with a paper clip. Third, look at the spray pattern of the two jets in the TBI, it should be a nice cone shape with no drips, a flash light helps to see better into the throttle body. I would then check the timing should 4 degrees before TDC. Some have advanced their timing up to 12 degrees before TDC. I advanced mine to 9 and it took 2 secs off my 40- 60 mph time. When you increase the idle speed the timing marks will should advance, mine will advance if I remember correctly to about 22 degrees if it doesn't you found the problem. My distributor is electronic, your 93 may be mechanical and others have already commented on that and the cat. Good luck and let us know what you find.

Unfortunately, the weather has turned sour today, and is expected to saty this way for next few days, so I won't be able to test drive it, but I can say with certainty that 40-60 mph is closer to the 40 second range, perhaps a little bit longer. 0-30 mph is where the MH seems to work best, then after that it will fall flat on it's face until I reach about 65 mph. At that point it shifts into high gear, and assuming i have no inclines, will haply stay there all day. Any incline at all will have it shift down into 3rd, and no matter the throttle position, will only make 'noise' (engine revs are higher), but no additional power/acceleration. beyond 1/4 throttle, makes no difference in power.
Since I first wrote this post, I've noticed that the service engine light has come on, and the code is 44 ( Oxygen sensor error (lean condition indicated)), so I will have to look into the cause of that before I can rule that out.
The timing was difficult to read, but it appears to be at 4 BTDC( Access is difficult at best), in park with the engine warmed up and at idle.
I will have a look at the distributor and injector spray patter as you and others have mentioned in the next few days as well.
I did have a leak at the passenger side exhaust manifold (rear bolt broke off, and I've since repaired that) not certain if that was the cause of the code 44, but will reset the computer to see for certain.
I certainly would have expected the gas consumption to have decreased with O2 sensor indicating lean, however that is not the case.